Jacaranda decurrens Cham.
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Authority
Gentry, Alwyn H. 1992. Bignoniaceae--part II (Tribe Tecomeae). Fl. Neotrop. Monogr. 25: 1-370. (Published by NYBG Press)
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Family
Bignoniaceae
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Scientific Name
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Type
Type. Brazil Sellow s.n. (B*, F photo 18467). Neotype. Brazil. São Paulo: Mun. Botucatu, 550 m, Morawetz 12-9975 (WU, isotype, MO).
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Synonyms
Jacaranda pteroides Silva Manso, Jacaranda robertii S.Moore, Jacaranda decurrens var. glabrata Hassl.
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Description
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Species Description - Xylopodial subshrub 20-50(-100) cm tall, the branchlets subterete, more or less glabrescently pilose, without whitish lenticels. Leaves bipinnate, (25-)30-40(-50) cm long, with 14 to 26 pinnae, each pinna with varyingly pilose more or less winged rachis and 5-39 sessile oblong, usually incompletely separated leaflets, these 0.7-1.5 cm long and 0.3-0.6 cm wide, apex obtuse to acutish, usually apiculate, with the base usually decurrent and more or less continuous with the winged rachis, usually sparsely to densely pilose at least along midvein below, sometimes completely glabrescent, coriaceous, more or less bullate, the margin involute. Inflorescence a small contracted terminal panicle much exceeded by the leaves, pilose, in part with gland-tipped trichomes, bracts thin, narrowly oblong, to 3-4 mm long. Flowers with the calyx deeply 5-parted to near base, the lobes oblong-ovate or oblong-lanceolate, acute to subacuminate, 4-6 mm long, ca. 2 mm wide, more or less sparsely pilose at least around margins, in part with gland-tipped trichomes; corolla blue or bluish purple, tubular-campanulate above a narrow neck which is curved and enlarged toward the base, 4-5 cm long, 1-2 cm wide at the mouth, the lobes 1 cm long, the tube 3-4 cm long, puberulous outside, in part with gland-tipped trichomes, rather densely near base, more sparsely on rest of tube, the lobes somewhat pilose with long weak trichomes, inside with scattered long trichomes in throat, also glandular villous on stamen insertions; stamens didynamous, the anthers monothecate, the second theca reduced to a minute 0.5 mm long appendage, each theca 2-2.5 mm long, the staminode 2.5-3 cm long, included to subexserted, densely glandular villous, the apex not or very slightly expanded; ovary flattened-ovate, 2 mm long, 1.2 mm wide, glabrous; disk patelliform-pulvinate, 1 mm long, 2 mm wide. Fruit elliptic to obovate-elliptic, strongly woody, with a more or less developed short basal stipe, 6.5-10 cm long, 4.5-6.5(-8) cm wide (l:w = 1.1-1.5), the margin not undulate at dehiscence, glabrous except for a few scales, the surface microscopically fissuring, drying yellowish tan to brownish; seeds flat suborbicular, 2-2.5 cm long, 2.5-3 cm wide, the hyaline-membranaceous wing surrounding and not sharply demarcated from the seed body.
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Discussion
The only xylopodial subshrub of section Monolobos; also very distinctive in the small inflorescence much exceeded by the leaves and the leaflet bases usually strongly decurrent on the rachis and incompletely differentiated from it. The woody fruits, borne at ground level, are also unique. Western collections tend to have leaflets with much less decurrent bases but are otherwise so similar that no taxonomic distinction seems warranted. Morawetz (1982) has suggested that such forms may represent hybridization with J. cuspidifolia, at least in Paraguay.
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Common Names
Pará parai mi
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Objects
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Distribution
Cerrado and campos cerrados from São Paulo and the Sierra de Amambay of Paraguay to Mato Grosso, Goiás, and Minas Gerais; 500-800 m elevation.
Brazil South America| Goiás Brazil South America| Mato Grosso Brazil South America| Minas Gerais Brazil South America| São Paulo Brazil South America| Paraguay South America| Amambay Paraguay South America|