New taxa and nomenclatural notes on the flora of the Marojejy Massif, Madagascar. I. Capparaceae: A new species of Crateva

摘要: A new species of Crateva L. is described from the Marojejy Massif in northeast Madagascar. It differs previously having simple obovate leaves with a rounded apex. The deciduous and flowers soon after emerge, indicating that it member section Siccoruba Jacobs. an isolated upland area northeastern Madagascar province Antsiranana. Located between Andapa, to west, Sambava, east, massif rises out undulating lowlands vast mostly above 800 m its highest point at 2137 m, Est. bounded by valleys Androranga River on north Lokoho south. easternmost satellite regions surround Tsaratanana, which lies approximately 100 km northwest 2876 center northern highlands. areas occur closest proximity include Betsomanga (ca. 1250 m) ca. 25 north, Andramanalana (2260 40 For&t D'Anjanaharibe 1850 southwest. large number endemic taxa have been reported (Humbert, 1955), but unclear what percentage these also scattered peaks as most remain very poorly explored. central portion some surrounding lowland comprise 50,000-ha protected area, Reserve Int6grale No. 12, was established 31 December 1927. consists uplifted gneiss, topography extremely rugged numerous reserve 1500 m. Foret d'Anjanaharibe watershed for Andapa region, one Madagascar's important rice-producing areas. Prevailing winds come southeast, somewhat drier than southern eastern flanks massif. portions consist mosaic evergreen tropical forest, canopy 30--60 tall secondary growth cyclone disturbance dominated Afromomum angustifolium K. Schumann several bamboo. steep slopes 500 1000 are forested, except exposed gneiss extreme slopes. Above variety vegetation types occur, depending slope, exposure, depth soil. More sheltered covered wet, medium-height forest (the sylve d lichens Humbert, whereas wind-swept ridges below about 1700 dense cover shrubs occasional trees 5 uppermost reaches open, primarily herbaceous Cyperaceae, Poaceae, Orchidaceae patches up meter composed Rubiaceae, Ericaceae, Symphonia microphylla (Cambessades) Bentham & Hooker ex Vesque (Clusiaceae). Henri Humbert collected intensively 1948 1950, discovering many clearly demonstrating endemism within 1955). However, Humbert's published accounts his collecting were not comprehensive, author began effort inventory region thoroughly four trips 1988 1989. Since time intensive has continued, results will be summarized checklist (Miller, Rakotomalaza, Raharilala, Rakotondrainibe, prep.). These recent efforts yielded discoveries named this series, although Ardisia Swartz (Myrsinaceae) based collections (Miller Pipoly, 1993). genus (see G6mez, 1953, notes correct orthography generic name) eight widely distributed tropics (Jacobs, 1964), three Although Hadj Moustapha (1965) recognized species, Jacobs (1964) pointed humblotii (Baillon) Hadj-Moustapha confused name robably Capparis humblottii Baillon specimens referable C. excelsa Bojer obovNovoN 8: 167-169. 1998. This content downloaded 207.46.13.131 Sat, 15 Oct 2016 04:19:22 UTC All use subject http://about.jstor.org/terms