Senna kuhlmannii Hoehne
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Authors
Howard S. Irwin, Rupert C. Barneby
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Authority
Irwin, Howard S. & Barneby, Rupert C. 1982. The American Cassiinae. A synoptical revision of Leguminosae tribe Cassieae subtrib Cassiinae in the New World. Mem. New York Bot. Gard. 35, part 1: 1-454.
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Family
Caesalpiniaceae
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Scientific Name
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Synonyms
Cassia cachimboensis H.S.Irwin & Barneby
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Description
Species Description - Amply leafy shrubs of rounded outline 1-2.5 m, with blackish trunks, smooth atropurpureous hornotinous branchlets clothed in stiffly chartaceous foliage, except for the strigulose ovary glabrous, or the young lvs minutely fugaciously puberulent, the penniveined lfts bicolored, lustrous above, paler and dull beneath. Stipules erect linear-subulate 2.5-4.5 mm, fugacious, lacking from mature lvs. Lvs ascending 5-13 cm; petiole with pulvinus 5-14 mm, the latter 2-5.5 mm slightly inflated, wrinkled when dry, the petiole proper, like each segment of the lf-stalk, openly sulcate ventrally, the sulcus gradually dilated upward; glands between or immediately contiguous to each pair of pulvinules sessile or subsessile, round or broadly elliptic in outline (1.3-) 1.6-3 mm diam, disci- or shallowly patelliform, coarsely blunt-margined; lfts (1-)2-3 pairs ascending from rachis face upward on dilated, when dry wrinkled, sulcate pulvinules 2-4.5 mm, accrescent distally, in outline subsymmetrically obovate to broadly oblanceolate obtuse, minutely or widely emarginate (1.5-)2.5-8 x (1-) 1.2-3(-3.8) cm, at base sub- equally rounded to broadly cuneate, the margin revolute, the straight midrib from base finely penniveined, with (5-)6-9(-10) pairs of widely ascending camptodrome secondary veins prominulous on both faces but more sharply so beneath, a fainter tertiary reticulation raised beneath. Racemes short-pedunculate from upper lf-axils, loosely 3-11-fld, the peduncle and axis together 3-8 cm; bracts minute caducous, accompanied on one or other side (alternately) by a deciduous claviform-stipitate gland; pedicels widely ascending 2.5-3.5 cm; sepals subpetaloid membranous-margined, all obovate obtuse but very unequal in size, 1 dorsal and 1 ventral exterior 3.5-5 mm, 3 inner larger up to 11-14 mm; petals yellow glabrous, all obovate obtuse or emarginate, narrowed at base into a slender claw ±3-5 mm, the vexillary and lateral ones plane, the 2 abaxial concave, all coarsely 3-veined from claw, the central vein arborescently branched upward; androecium 10-merous, of 3 staminodes ±5 mm, 4 fertile stamens with short filament and thecae ±6-6.5 mm, and 3 abaxial fertile with filament ±5 mm and thecae 9-15 mm, the fertile thecae all contracted at apex into a biporose beak 0.7-1.2 mm; ovary strigulose; style ±1 cm, incurved and slightly dilated at tip; ovules 18-26. Pod linear straight, strongly compressed, including short stipe and setiform beak 7.5-11.5 x 0.9-1.1 cm, the ripe valves nigrescent papery, tardily and inertly dehiscent along ventral suture; seeds oblong compressed 4.8-5.3 mm, the testa dull castaneous bearing on either face a paler, slightly depressed, oblong areole ±2.5 x 0.5-0.6 mm.—Collections: 12.
Distribution and Ecology - Thickets in campo cerrado, on sandy soils or about sandstone outcrops, 140-460 m, locally abundant on and about the Sa. do Cachimbo in s.-w. Para and apparently disjunct on the Jiparana-Roosevelt divide in s.-e. Terr, do Rondonia.— Fl. V-VIII, the fruit long persistent.
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Distribution
Pará Brazil South America| Rondônia Brazil South America|