Cassiinae pt 1 NY-Botanical_gardens_Vol. 35_1 - Copy.pdf - Antbase

412 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [VOL. 35
132. Senna colUcola Irwin & Barneby, sp. nov., S. ligustrinae proxima, sed fohohs
angustissime lanceolato-acuminatis basin versus 2-4 (nee 6-20)
mm latis, alabastris pUosuUs (nee glabris) styloque apicem versus lev­
iter tantum per ±45° incurvo (nee abrupte per 140-300° hamatim re-
curvo) diversa.—HAITI. Departement de I'Ouest: Guimbi Galata,
Mornes des Commissaires, 21.VI. 1942 (fljun), L. R. Holdridge 1279.—
Holotypus, NY; isotypi, BM, MO!
Slender shrubs up to ±1 m, the prominently lenticellate leafless annotinous
stems branched distaUy, the densely leafy young stems, h-stalks and inflorescence
pUosulous with incurved-spreading whitish hairs up to 0.6 mm, the ciholate hts
faciaUy glabrous except for a minutely puberulent Une along costa above, the
foUage bicolored, when dry brownish-olivaceous above, paler beneath, the few-
fld, shortly pedunculate racemes crowded in upper h-axUs and forming a small
immersed panicle.
Stipules erect, thinly herbaceous, narrowly lanceolate ±4-6 x 1-1.5 mm, at
base obscurely cordate on side further from petiole, early deciduous.
Lvs 7-14 cm; petiole including httle swoUen pulvinus 3-25 mm, at middle
0.5-0.8 mm diam, carinate dorsally, very narrowly and shallowly sulcate ven­
traUy; rachis 4-7.5 cm; gland near base of h-stalk, contiguous or almost so to
pulvinus, sometimes accompanied by a pair of smah lfts, sometimes up to ±2 cm
distant from proximal pair, in either case stipitate incurved-erect, in profile 2-3
mm tah, the slenderly lanceolate-acute body 0.3-0.5 mm diam, often similar but
more slender glands between 1-3 distal pairs of lfts; pulvinules ±1 mm; hts 6-8
pairs, the proximal smahest, the rest shghtly or scarcely accrescent, the longer
ones narrowly subobhquely lance-attenuate 2-3.5 x 0.2-0.4 cm, ±7-14 times as
long as wide, the margins strongly revolute, the midrib sulcate ventraUy, carini­
form dorsally, the ±6-7 pairs of obscurely camptodrome secondary veins faintly
raised dorsally on proximal half of blade, invisible distally and on ventral face.
Peduncles 3-17 mm; racemes very shortly subcorymbosely 3-5-fld, the axis up
to 6 mm; bracts thinly herbaceous lanceolate 5.5-7 x 1.7-2.3 mm, persistent into
anthesis; pedicels at anthesis ±13-15 mm; fl-buds ascending, densely shortly
pUosulous; sepals firm, fuscous except for palhd margin, weh graduated, the
suborbicular outer ones 4-5 mm, the elhptic-obovate inner ones 6.5-9 mm; petals
glabrous orange-yellow drying whitish brown-veined, in shape hke those of S.
Ugustrina, the longest 10-12 mm; androecium glabrous, the staminodes ±1.4 mm
wide, the filaments of 4 median stamens 1.5 mm, of 2 long abaxial ones dilated
3.5^.5 mm, the anthers of 4 median stamens 4.5 mm, obliquely truncate 2-po­
rose, those of 2 long abaxial ones lunately incurved 5.5 x 1.3 mm, scarcely constricted
subapicahy, brownish yellow-tipped, the pollen-cup only 0.4 mm long,
the centric abaxial stamen rudimentary; ovary pUosulous lateraUy; style ±2.5
mm, at apex moderately thickened 0.4 mm diam, incurved only through ±45°,
the lateral stigmatic cavity longer than wide.
Pod incompletely known from year-old fragments, apparently much Uke that
of S. Ugustrina and S. stenophyUa, the papery valves ±6 mm wide; seed unknown.—Collection:
1.
Habitat not recorded, known only from the type-locahty near 1800 m in the
mountains of Departement de I'Ouest, Haiti.—Fl. VI-VII(-?).
The evidently rare and local S. collicola appears, hke the related Cuban S.
stenophylla, to be derived from relatively widespread S. ligustrina. AU three have
the same slender pointed petiolar gland which varies in position, sometimes from
leaf to leaf on one plant, from genuinely basal (contiguous to the pulvinus) to