https://www.peterdeltredici.com/home daily 1.0 2025-12-03 https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582600632159-I5S9FQA1K2G9QV8RV7W5/PDT-Fig1a2.jpg Home Tall morning glory in flower https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1583445313613-9URA2GSHX5V7KKIVBQX6/5.30+Spotted+knapweed+in+an+abandoned+Detroit+parking+lot.JPG Home Spotted knapweed in a vacant parking lot https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582045086969-3C66E0BWC2LZIC2JNY1V/Fig1c-Del+Tredici+cover+final.jpg Home Just Released—Second edition of Wild Urban Plants of the Northeast https://www.peterdeltredici.com/bio daily 0.75 2025-12-04 https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581973289817-I190MUBSZA1J8C04PZJO/PDT-About-Fig3a.jpg Bio Peter Del Tredici with the bigleaf magnolia (Magnolia macrophylla) at the Arnold Arboretum. Photo by S. Klaw. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581973307245-R9M6Y2VYXXKSPUHJ76BJ/PDT-About-Fig3b.jpg Bio Spontaneous silver maple (Acer saccharinum) growing along the banks of the Charles River in Cambridge MA. https://www.peterdeltredici.com/new-book daily 0.75 2025-12-04 https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581967814914-C7383IRJW6U0SLFJ2MLQ/PDT-Fig1c.jpg New Book https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581969499655-3PV9SPDPIMB0NYB3N3K9/PDT-NewBOOK-Fig2.jpg New Book Peter Del Tredici with one of his classes at the Harvard Forest in Petersham, MA. Photo by D. Foster https://www.peterdeltredici.com/research-pubs daily 0.75 2025-12-04 https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581981483234-GOE3T7X74FJYM43P9GC0/PDT-Fig4.1a-Matricaria+in+Berlin+photo+by+Susan+Klaw.jpg Research & Publications Peter Del Tredici photographing pineapple weed (Matricaria discoidea) in Berlin in 2010. Photo by S. Klaw https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581981504452-DB73VUQ7WMMXMN6YIHNS/PDT-Fig4.1b-Loading+dock+wetland+Detroit+May+2009.jpg Research & Publications Loading dock wetland in Detroit. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581981526080-XW1B1LRLQCD4FRZ0FE6L/PDT-Fig4.1c-Oriental+bittersweet+in+Boston.jpg Research & Publications Oriental bittersweet in Boston. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581982723956-T32KSBCXONDZ7FCVTRSI/PDT-Fig4.2a-New+Jersery+Meadowlands+Fall+2015.jpg Research & Publications Peter Del Tredici in the New Jersey Meadowlands in 2014. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581982747999-PIXWA5UPU2QAH5X7HVKS/PDT-Fig4.2b-Oriental+bittersweet--a+botanical+boa+constrictor.jpg Research & Publications Oriental bittersweet (Celastrus orbiculatus)—a botanical boa constrictor. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1583416715233-DX460LCQY6314EYRCT64/Japanese+knotweed+in+flower+in+August.jpg Research & Publications Japanese knotweed in full flower in August. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582601770851-XL7P5R0K728WESUQVYGL/PDT-Fig4.3a2-Canada+goldenrod+%26+white+heath+aster+in+a+cosmopolitan+urban+meadow.jpg Research & Publications Canada goldenrod and white heath aster in a “cosmopolitan urban meadow.” https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581983130437-1BAVDWIC2Z6XO81T0ESS/PDT-Fig4.3b-freedom+lawn.jpg Research & Publications The “freedom” lawn in Peter Del Tredici’s front yard. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581983149537-DH6245ZV84VWBDA6UJEO/PDT-Fig4.3c-Spontaneous+forest+in+NJ.jpg Research & Publications Spontaneous urban forest in New Jersey. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582917101412-VSFZXVM5KAN6PNPWX61L/PDT-Fig4.4a2-Morus+alba+Watertown+2004.jpg Research & Publications White mulberry (Morus alba) sprouting back following wind damage. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581986362254-YFRDCDW5ZMOLURN4O1ER/PDT-Fig4.4b-Umbellularia+Quarryhill+burn+Sept+2017+Sept+18+%2845%29.jpg Research & Publications California bay laurel (Umbellularia californica) sprouting back after the Tubbs fire in Sonoma, CA in 2016. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581986380598-BD3HTXAEOX9R0H7JAED2/PDT-Fig4.4c-Silver+Maple+sprouting.jpg Research & Publications Silver maple (Acer saccharinum) sprouting back after failed attempts at removal. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581987417263-MG90Y66S5KUHXD94KR64/PDT-Fig4.5a-Li+Jia+Wan+Grand+Ginkgo+King+Guizhou+2002+%283%29.jpg Research & Publications Peter Del Tredici and some of his Chinese colleagues with the largest Ginkgo tree (in terms of girth) on the planet in Guizhou Province, China in 2002. Photo by J. Li https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581987441566-0KA5H5WELQYUKMFI1LS8/PDT-Fig4.5b-Ginkgos+on+Gaiemmae+Street%2C+Tokyo+2012.jpg Research & Publications A quadruple row of Ginkgos at peak fall color on Gaiemmae Street in Tokyo in 2012. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581987461331-S0AJ71U8D16J5PL9P1FP/PDT-Fig4.5c-the+iconic+Ginkgo+leaf.jpg Research & Publications The iconic Ginkgo leaf. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581987991964-YMW3X6QJS0GG5X2UKF5D/PDT-Fig4.6a-Tsuga+canadensis+in+Ashville+NC.jpg Research & Publications Peter Del Tredici with a mature eastern hemlock (Tsuga canadensis) in Ashville, NC. Photo by P. Meyer https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581988017607-HAL8ONRDBY16ZHZ2YUEI/PDT-Fig4.6b-New+hemlock+species%2C+Tsuga+ulleungensis+in+the+wild+2008.jpg Research & Publications The newly described hemlock, Tsuga ulleungensis, on the island of Ulleungdo, South Korea photographed in 2008 https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581988037792-KHNE00YBZ5JWWXK3F6PU/PDT-Fig4.6c-weeping+hemlock.jpg Research & Publications Peter Del Tredici with a mature weeping hemlock in 1980 https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581988669519-WPSPK79YTAVKX0UIFC8L/PDT-Fig4.7a-Stewartia+monadelpha+on+Yakushima+2012.jpg Research & Publications Peter Del Tredici with tall Stewartia (Stewartia monadelpha) on Yakushima Island, Japan in October 2012. Photo by T. Kirkham https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581988722875-WK0UOKEOR08SAEVCF8NK/PDT-Fig4.7b-Stewartia+ovata+in+South+Carolina+June+2009.jpg Research & Publications Peter Del Tredici with mountain Stewartia (Stewartia ovata) in the mountains of South Carolina in June 2009. Photo by J. Johnson https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581988746235-T2VJC7IWX08CMLSIUSUZ/PDT-Fig4.7c-Stewartia+pseudocamellia+flowers.jpg Research & Publications Korean Stewartia (Stewartia pseudocamellia) flowering at Arnold Arboretum. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581991919435-RLG8FPTTKW44AEHL4IU5/PDT-Fig4.8a-Parrotia+subaequalis+Longwan+Shan+Zhejiang+PDT+%287b%29.jpg Research & Publications Peter Del Tredici with Chinese parrotia (Parrotia subaequalis) on Longwan Shan, Zhejiang Province, China in 2002. Photo by J. Li https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581991941606-8NZ6NV3CSOD84Z4N5SQR/PDT-Fig4.8b-North+Korean+border+in+1997.jpg Research & Publications Peter Del Tredici on the Chinese – North Korean border in 1997. Photo by P. Meyer https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1583414612910-8MUQXCRFCUETQ90O05YK/Fig+4.4a.+PDT+%26+Acer+grisium+Wudang+Shan+Oct+1994+photo+Paul+Meyer.jpg Research & Publications Peter Del Tredici with paperbark maple (Acer grisium) on Wudang Shan, Huberi Province, China in 1994. Photo by P. Meyer https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581992521970-880LRVHEG633GC1OCHZV/PDT-Fig4.9a-studying+Casurina+root+nodules+at+the+Harvard+Forest+in+1975.jpg Research & Publications Peter Del Tredici studying root nodules on Australian pine (Casurina equisetifolia) growing in aeroponic culture at the Harvard Forest in 1975. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581992543071-ZCOKP1OZB6A9H09XGEQC/PDT-Fig4.9b-Comptonia+root+nodule.jpg Research & Publications Close-up of a nitrogen-fixing root nodule on sweet fern (Comptonia peregrina). https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1583338373878-CI9RTLM05DHHM51O5MYK/Sweet+fern+growing+in+pure+sand+on+Cape+Cod.jpg Research & Publications Sweet fern (Comptonia peregrina) growing in pure sand on Cape Cod. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581993207422-TC8DMFARMJHMZLKOW0I6/PDT-Fig4.10a-bonsai.jpg Research & Publications Peter Del Tredici repotting an ancient Chabo-hiba hinoki cypress at the Arnold Arboretum. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581993230209-1GMRA45JGW71ML4GX5FA/PDT-Fig4.10b-Chabo-hiba+cypress.jpg Research & Publications Compact hinoki cypress (Chamaecyparis obtusa ‘Chabo-hiba’) started in Japan in 1787. In 2006, it was 74 inches wide. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582601465618-F228OWQSVNJQJ2D4PYE7/PDT-Fig4.10c-bonsai.jpg Research & Publications Trident maple (Acer buergerianum) in fall color at Arnold Arboretum, started in 1852. In 2006, it was 34 inches tall. https://www.peterdeltredici.com/photo-gallery daily 0.75 2020-03-06 https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582081094857-J6O7FUQ0YNBMEUP0ZFF0/PDT-5.1-Birdsfoot+trefoil+is+tolerant+of+compacted+soil.jpg Photo Gallery Birdsfoot trefoil is tolerant of compacted soil https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582081111551-VVCRZC1T9ZD5H6CU25DP/PDT-5.5-Bull+thistle+shedding+its+seeds.jpg Photo Gallery Bull thistle shedding its seeds https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582606997960-EOQ026OQ44VN5HPZ4P66/PDT-5.9-Daisy+fleabane+and+Black+eyed+Susan+in+flower.jpg Photo Gallery Daisy fleabane and Black eyed Susan in flower https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582607096866-DNTU1S5OMHSHPHYK802F/PDT-5.17-Japanese+knotweed+arbor+in+the+New+Jersey+Meadowlands.jpg Photo Gallery Japanese knotweed arbor in the New Jersey Meadowlands https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582607107476-E014OKHZMDEPT6IW7KSD/PDT-5.18-Jimson+weed+flower+head-on.jpg Photo Gallery Jimson weed flower head-on https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582607151606-Y3YS3RMSCYO1SW4WWK3M/PDT-5.21-Milkweed+seeds+on+the+cusp+of+dispersal.jpg Photo Gallery Milkweed seeds on the cusp of dispersal https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582607170335-8B2A96TX82ICFOJUBMRS/PDT-5.22-Monet+with+weeds+in+Detroit.jpg Photo Gallery Monet with weeds in Detroit https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582607181395-NZAPHBZJI5OUO7HT957A/PDT-5.23-Northern+catalpa+seedling+with+opposite+leaf+arrangemnt.jpg Photo Gallery Northern catalpa seedling with opposite leaf arrangemnt https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582607422139-GFJI36U7ZSYGXLXZ3IFS/5.33+Tree+of+heaven+in+Berlin.JPG Photo Gallery Tree of heaven in Berlin https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582607468311-7D5A5QBNL8SHNYBXHQ3W/PDT-5.37-Virginia+creeper+in+fall+color+in+Boston.jpg Photo Gallery Virginia creeper in fall color in Boston https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582855800865-PHR8STK37NGKNST8UC1R/Sweet+autumn+clematis+fruits.jpg Photo Gallery Sweet autumn clematis fruits https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1583332894588-L9DIU38NFB8TYYASEEFH/5.11+Dandelion+flowers+often+attract+flies.JPG Photo Gallery https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1583332941651-BIW8R43WZPIP42A1FY39/Chicory+Detroit+%282%29.JPG Photo Gallery https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1583502945816-2SA9T3KJWYP2RN377SNF/5.2+Bittersweet+nightshade+flowers.JPG Photo Gallery https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1583503075810-KIDKVZA9XXUESQ6EHHNW/5.13+European+mountain+ash+in+fall+color.jpg Photo Gallery https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1583503534808-99FKUJN6O6GDNKOP033D/5.19+Maintenance+crews+would+love+to+remove+this+American+elm.JPG Photo Gallery https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1583503589846-4QX44F4DSHVT22MQVT6W/5.25+Princess+tree+on+a+crumbling+brick+building.jpg Photo Gallery https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1583503624154-QF3WKS5U8W262WPHNTF2/5.40+Yellow+foxtail+grass+in+fruit.JPG Photo Gallery https://www.peterdeltredici.com/lectures daily 0.75 2026-03-13 https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1583337640323-XCO9HYM71IB5Z6WN8OWY/Fig+6.+PDT+leading+AA+walk.jpg Lectures Peter Del Tredici leadinga a walk at Arnold Arboretum. Photo by P. Thompson https://www.peterdeltredici.com/contact daily 0.75 2020-03-06 https://www.peterdeltredici.com/research-pubs-copy-testing daily 0.75 2020-02-29 https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581981483234-GOE3T7X74FJYM43P9GC0/PDT-Fig4.1a-Matricaria+in+Berlin+photo+by+Susan+Klaw.jpg Research & Pubs (Copy) testing Peter Del Tredici photographing pineapple weed (Matricaria discoidea) in Berlin in 2010. Photo by S. Klaw. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581981504452-DB73VUQ7WMMXMN6YIHNS/PDT-Fig4.1b-Loading+dock+wetland+Detroit+May+2009.jpg Research & Pubs (Copy) testing Loading dock wetland in Detroit. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581981526080-XW1B1LRLQCD4FRZ0FE6L/PDT-Fig4.1c-Oriental+bittersweet+in+Boston.jpg Research & Pubs (Copy) testing Oriental bittersweet in Boston. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581982723956-T32KSBCXONDZ7FCVTRSI/PDT-Fig4.2a-New+Jersery+Meadowlands+Fall+2015.jpg Research & Pubs (Copy) testing Peter Del Tredici in the New Jersey Meadowlands in 2014. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581982747999-PIXWA5UPU2QAH5X7HVKS/PDT-Fig4.2b-Oriental+bittersweet--a+botanical+boa+constrictor.jpg Research & Pubs (Copy) testing Oriental bittersweet (Celastrus orbiculatus)—a botanical boa constrictor. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581982770034-D9V0QMWJ119TZPW47FAV/PDT-Fig4.2c-Japanese+knotweed.jpg Research & Pubs (Copy) testing Japanese knotweed at home in the city. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582601770851-XL7P5R0K728WESUQVYGL/PDT-Fig4.3a2-Canada+goldenrod+%26+white+heath+aster+in+a+cosmopolitan+urban+meadow.jpg Research & Pubs (Copy) testing Canada goldenrod and white heath aster in a “cosmopolitan urban meadow.” https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581983130437-1BAVDWIC2Z6XO81T0ESS/PDT-Fig4.3b-freedom+lawn.jpg Research & Pubs (Copy) testing The “freedom” lawn in Peter Del Tredici’s front yard. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581983149537-DH6245ZV84VWBDA6UJEO/PDT-Fig4.3c-Spontaneous+forest+in+NJ.jpg Research & Pubs (Copy) testing Spontaneous urban forest in New Jersey. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582937812642-10DD5ZU9LTTY97OYX3TG/image-asset.jpeg Research & Pubs (Copy) testing White mulberry (Morus alba) sprouting back following wind damage. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581986362254-YFRDCDW5ZMOLURN4O1ER/PDT-Fig4.4b-Umbellularia+Quarryhill+burn+Sept+2017+Sept+18+%2845%29.jpg Research & Pubs (Copy) testing California bay laurel (Umbellularia californica) sprouting back after the Tubbs fire in Sonoma, CA in 2016. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581986380598-BD3HTXAEOX9R0H7JAED2/PDT-Fig4.4c-Silver+Maple+sprouting.jpg Research & Pubs (Copy) testing Silver maple (Acer saccharinum) sprouting in Boston. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581987417263-MG90Y66S5KUHXD94KR64/PDT-Fig4.5a-Li+Jia+Wan+Grand+Ginkgo+King+Guizhou+2002+%283%29.jpg Research & Pubs (Copy) testing Peter Del Tredici and some of his Chinese colleagues with the largest Ginkgo tree (in terms of girth) on the planet in Guizhou Province, China in 2002. Photo by J. Li https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581987441566-0KA5H5WELQYUKMFI1LS8/PDT-Fig4.5b-Ginkgos+on+Gaiemmae+Street%2C+Tokyo+2012.jpg Research & Pubs (Copy) testing A quadruple row of Ginkgos at peak fall color on Gaiemmae Street in Tokyo in 2012. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581987461331-S0AJ71U8D16J5PL9P1FP/PDT-Fig4.5c-the+iconic+Ginkgo+leaf.jpg Research & Pubs (Copy) testing The iconic Ginkgo leaf. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581987991964-YMW3X6QJS0GG5X2UKF5D/PDT-Fig4.6a-Tsuga+canadensis+in+Ashville+NC.jpg Research & Pubs (Copy) testing Peter Del Tredici with a mature eastern hemlock (Tsuga canadensis) in Ashville, NC. Photo by R. Schulhof https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581988017607-HAL8ONRDBY16ZHZ2YUEI/PDT-Fig4.6b-New+hemlock+species%2C+Tsuga+ulleungensis+in+the+wild+2008.jpg Research & Pubs (Copy) testing The newly described hemlock, Tsuga ulleungensis, on the island of Ulleungdo, South Korea. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581988037792-KHNE00YBZ5JWWXK3F6PU/PDT-Fig4.6c-weeping+hemlock.jpg Research & Pubs (Copy) testing Peter Del Tredici with a mature weeping hemlock in 1980. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581988669519-WPSPK79YTAVKX0UIFC8L/PDT-Fig4.7a-Stewartia+monadelpha+on+Yakushima+2012.jpg Research & Pubs (Copy) testing Peter Del Tredici with tall Stewartia (Stewartia monadelpha) on Yakushima Island, Japan in October 2012. Photo by T. Kirkham https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581988722875-WK0UOKEOR08SAEVCF8NK/PDT-Fig4.7b-Stewartia+ovata+in+South+Carolina+June+2009.jpg Research & Pubs (Copy) testing Peter Del Tredici with mountain Stewartia (Stewartia ovata) in the mountains of South Carolina in June 2009. Photo by J. Johnson https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581988746235-T2VJC7IWX08CMLSIUSUZ/PDT-Fig4.7c-Stewartia+pseudocamellia+flowers.jpg Research & Pubs (Copy) testing Korean Stewartia (Stewartia pseudocamellia) flowering at Arnold Arboretum. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581991919435-RLG8FPTTKW44AEHL4IU5/PDT-Fig4.8a-Parrotia+subaequalis+Longwan+Shan+Zhejiang+PDT+%287b%29.jpg Research & Pubs (Copy) testing Peter Del Tredici with Chinese parrotia (Parrotia subaequalis) on Longwan Shan, Zhejiang Province, China in 2002. Photo by J. Li https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581991941606-8NZ6NV3CSOD84Z4N5SQR/PDT-Fig4.8b-North+Korean+border+in+1997.jpg Research & Pubs (Copy) testing Peter Del Tredici on the Chinese – North Korean border in 1997. Photo by P. Meyer https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581991963752-6WUJHFISV9689JQ3M59U/PDT-Fig4.8c-Abies+in+China.jpg Research & Pubs (Copy) testing Peter Del Tredici collecting Manchurian fir (Abies nephrolepis) in China in 1997. Photo by P. Meyer https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581992521970-880LRVHEG633GC1OCHZV/PDT-Fig4.9a-studying+Casurina+root+nodules+at+the+Harvard+Forest+in+1975.jpg Research & Pubs (Copy) testing Peter Del Tredici studying root nodules on Australian pine (Casurina equisetifolia) growing in aeroponic culture at the Harvard Forest in 1975. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581992543071-ZCOKP1OZB6A9H09XGEQC/PDT-Fig4.9b-Comptonia+root+nodule.jpg Research & Pubs (Copy) testing Close-up of a nitrogen-fixing root nodule on sweet fern (Comptonia peregrina). https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581992567309-OU9SAM59FRD3X2L52G15/PDT-Fig4.9c-Nitrogen+fixing+root+nodules+on+sweet+clover.jpg Research & Pubs (Copy) testing Nitrogen-fixing root nodules on white sweet clover. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581993207422-TC8DMFARMJHMZLKOW0I6/PDT-Fig4.10a-bonsai.jpg Research & Pubs (Copy) testing Peter Del Tredici repotting an ancient Chabo-hiba hinoki cypress at the Arnold Arboretum. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1581993230209-1GMRA45JGW71ML4GX5FA/PDT-Fig4.10b-Chabo-hiba+cypress.jpg Research & Pubs (Copy) testing Compact hinoki cypress (Chamaecyparis obtusa ‘Chabo-hiba’) started in Japan in 1787. In 2006, it was 74 inches wide. https://images.squarespace-cdn.com/content/v1/5e29cb0f89b39b36aa0d2748/1582601465618-F228OWQSVNJQJ2D4PYE7/PDT-Fig4.10c-bonsai.jpg Research & Pubs (Copy) testing Trident maple (Acer buergerianum) in fall color at Arnold Arboretum, started in 1852. In 2006, it was 34 inches tall.