Senna kurtzii (Harms) H.S.Irwin & Barneby
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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 2: 455-918.
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Family
Caesalpiniaceae
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Scientific Name
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Type
Lectoholotypus, Kurtz 7093, †B = F Neg. 1696; no isotypus seen; paratypus, Kurtz 7666, NY!
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Synonyms
Cassia kurtzii Harms, Cassia egregia Sandwith
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Description
Species Description - Stipules livid-reddish glanduliform, tumidly convex dorsally, in outline ovate- apiculate 1-1.6 mm, persistent. Lvs 7-23 mm; petiole including slender yellowish pulvinus 1-7 mm, at middle 0.25-0.5(-0.6) mm diam, obscurely sulcate; gland between proximal pair, slenderly fusi- or subuliform 0.4-0.7 x 0.1-0.4 mm, yellowish or orange; pulvinules 0.5-0.8 mm; lfts of almost all lvs 2 pairs, occasionally only 1 pair or subpalmately 3-foil, the distal pair longer, these narrowly or broadly obovate obtuse apiculate or shallowly emarginate 4-13 x 2.2-6 mm, ±1.5-2.2 times as long as wide, at base inequilaterally rounded, the margin plane pallid or discolored, the midrib bluntly prominulous beneath, the venation otherwise fully immersed. Peduncles ascending (1.5-)5-26 mm; racemes all 1- or partly 2-fld, the axis then 1-7 mm; bract subtending the first (or only) fl resembling a stipule in shape and texture 1.5-2.2 mm, of the second fl obsolete; pedicels 12-20 mm; fl-buds globose, either glabrous above the puberulent base or erratically setose-hirsute with weak straight hairs up to ±1 mm; sepals submembranous, obovate or suborbicular, the small outer ones often dark at middle, the inner membranous-margined, well graduated, the smallest outer one 3-5 mm, the largest inner one 6-9.5(-10) mm; petals glabrous golden- then orange-yellow, 4 oblong-obovate obtuse, one abaxial one with thickened claw and oblong-elliptic blade turned almost at right-angles to it, this petal a little longer than the rest ±15.5-17 mm; androecium glabrous, the staminodes ±2 mm wide, the filaments of 4 median anthers 1.8-2 mm, of 3 abaxial ones very unequal 3-.9(-10) mm, that of the centric stamen shortest, the anthers of 4 median stamens 3.6-4 mm up to the very short (±0.3 mm) ascending beak, those of the 3 abaxial stamens subequal lunately lanceolate in outline 4-5.5 x 1.3-1.7 mm, tapering at summit but not beaked, dehiscent by oblique short slits; ovary strigulose and sometimes also loosely ascending-pilose; style glabrous 1-1.4 x 0.25-0.3 mm almost straight; ovules 20-22. Pod (not well known) ascending and curved outward, the stipe 6-9 mm, the body 6.5-9 x 0.8-1 cm compressed linear bicarinate by the sutures, the firmly papery valves elevated over seeds in the form of simple transverse ridges, the interseminal septa very narrow, the locules ±3 mm long; seeds transverse, narrowly ovate in outline 4.7-5 x 2.7-2.8 mm, compressed parallel with the valves, the moderately lustrous brown dark-spotted testa rugulose, the elliptic or almost round areole 0.4-0.8 x 0.2-0.35 mm; 2n = 24.-Collections: 9.
Distribution and Ecology - Dry rocky hillsides and along intermittent stream beds, ±650-1600(-1700) m, locally plentiful in the e. foothills of the Andes drained by rios Atuel, Colorado and Neuquen, lat. 35°15'-39°S in Mendoza and Neuquen, Argentina.-Fl. XI-III.
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Common Names
Cacho carnero, yerba loca
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Distribution
Mendoza Argentina South America| Neuquén Argentina South America|