Jacaranda orinocensis Sandwith
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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. Venezuela. Bolívar: Río Pargueni, Wurdack & Monachino 39769 (holotype, NY; isotypes, K, S, US).
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Description
Species Description - Small shrubby, thicket-forming trees mostly 3-4 m tall, the branchlets minutely lepidote, with glandular trichomes near apex, otherwise glabrous. Leaves bipinnate (rarely in part simple pinnate) with 5-19 pinnae, these without wings on the rachis and with 3-13 subsessile leaflets, the leaflets rhomboid-oblong to obovate, acute or obtuse and cuspidate, cuneate at base, inaequilateral, 0.5-3.7 cm long, 0.3-1.8 cm wide, the terminal leaflet larger, generally glabrous, pilosulous along the base of the midvein below and minutely puberulous on the midvein above; leaves of sterile branches mostly larger than on fertile branches. Inflorescence paniculate, few-flowered but rather open, mostly terminal on young branches, the branches minutely and inconspicuously lepidote. Flowers with the calyx campanulate, 5-lobed, generally split to below the middle, lightly and irregularly lepidote, otherwise glabrous, the lobes spathulate-oblong or triangular-lanceolate, acute and obtuse, 3.5-5 mm long, 1.5-2 mm wide, the corolla purple-blue, curved, tubular-campanulate above the narrowly cylindrical neck, to 3.5 cm long and 1.5 cm wide at mouth of tube, the lobes ca. 1 mm long, ciliate, the tube glandular-pubescent and glandular-lepidote at base, otherwise glabrous, inside pubescent at level of stamen insertion; stamens didynamous, monothecate, the thecae 2-2.2 mm long, the staminode 2.7-3 cm long, the apex enlarged, glandular-pubescent at center and apex; pistil to 2.6 cm long, the ovary ovoid, glabrous, 1.5 mm in diam.; disk pulviniform, to 1.2 mm long, broader than the ovary. Fruit (immature) with rounded apex.
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Discussion
This species is characterized by the large thin leaflets and rather paucifoliolate leaves. One specimen (Wurdack & Monachino 40873) (NY) from Piedra Marimare, Río Orinoco, seems intermediate between this species and J. obtusifolia, with which it shares a pubescent ovary, and might be a hybrid.
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Objects
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Distribution
Endemic to the middle Orinoco in the area of Puerto Ayacucho. Apparently restricted to sandy river beaches where it is locally common and can form dense thickets; ca. 100 m elevation.
Venezuela South America| Amazonas Venezuela South America| Apure Venezuela South America| Bolívar Venezuela South America|