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

24 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [VOL. 33
5. Cassia cowanii Irwin & Barneby, sp. nov., hucusque perperam pro ahqua C.
leiandrae varietate habita sed ab ea foholis simul magis numerosis
(foUorum majorum 12-20, nee 6-11-jugis) oblongis (nee ovato-ellipti-
cis) et minoribus (majoribus plerumque 2.7-4.5 x 0.9-1.3, nee
5_7 X 1.4-2.5 cm), legumine tereti (nee corrugato) necnon ecologia
(nostra silvis non-inundabilibus incola) certe specifice separanda.—
Holotypus infra sub var. cowanii indicatur.
Potenrially tall forest trees attaining 40 m with basally dilated trunk up to 3 dm
diam at breast-height, flowering first when smaller, the annorinous branchlets
glabrate hvid or fuscous, bluntly angulate by blackish ribs descending from each
If-scar, the hornorinous branchlets together with If-stalks, dorsal face of lfts and
aU axes of inflorescence densely pUosulous with either crisply incurved or
straighter ascending, commonly lutescent hairs up to 0.1-0.3(-0.5) mm, the ex­
panding lvs at first yeUow-tomentulose, red in flush, at maturity bicolored, the
blades (dry) above brownish-olivaceous duU or moderately lustrous, finely thinly
puberulent, beneath paler dull, the racemes ascending singly or paired from nodular
spurs on annotinous or older branches, always weU below current fohage.
Stipules caducous from the expanding If (consequently httle known), subulate
or triangular-subulate 0.5-2 mm, absent from adult foUage.
Adult lvs (ll-)14-27(-35) cm; petiole including livid pulvinus 10-27(-32) mm;
rachis (9-)10-22(-29) cm, openly sulcate ventraUy, the sulcus interrupted at each
pair of lfts, the longer interfoholar segments 9-14(-16) mm; pulvinules 1-1.7 mm;
lfts 12-20 pairs, strongly decrescent at base of rachis, less so or not at aU so
distally, the Ift-blades in outline oblong obtuse or emarginate, at inequilateral
base broadly rounded to truncate or subcordate, the larger ones 2.7-
4.5(-5.4) X 0.9-1.3(-1.4) cm, the margin revolute, the midrib depressed on upper
and cariniform on lower face, the 11-15 pairs of rather crowded and widely diver­
gent camptodrome secondary veins becoming prominulous on both faces, a fine
tertiary and irregular but close reticular venulation becoming sharply raised at
least on the ventral face, sometimes on both.
Racemes subsessile 20-50-fld, the subglobose fl-buds densely racemose above
the several simultaneously expanded fls, the axis including short or obscure peduncle
becoming 8-16(-20) cm; bracts deltate-ovate or broadly lanceolate 2-4
mm, densely pUosulous both within and without, together with the similar but
shghtly smaller bracteoles deciduous either as the pedicel begins to lengthen or
not later than full anthesis of the subtended fl; pedicels (8-) 10-16 mm, greatly
thickened and woody in fruit; hypanthium ±1 mm, narrowly turbinate; sepals
firm, densely pilosulous on both faces, obovate, obovate-suborbicular or broadly
oblance-obovate, the inner onces 5.5-10 mm, aU early reflexed; petals usuaUy
golden-yeUow, rarely (in Guyana) orange-red, subhomomorphic, aU obovate or
ellipric-obovate beyond the short claw, enrire or minutely angulate-toothed at
base of blade; filaments of 3 long abaxial stamens 10-22 mm, of 2 abaxial antepetalous
ones erect 2.5-9 mm, of 3 other antepetalous ones fleshy-dilated
2-6 X 0.7-1.2(-1.8) mm, of 2 sterile alternate with the last 1.3-2 mm; anthers
glabrous or thinly pilosulous on back, of 3 long stamens erect 1.1-2.1 x 1-1.6
mm, of the rest resupinate, those of 2 abaxial antepetalous ones 1.8-3 mm, of 3
similar adaxial ones 1.4-2.3 mm, of 2 sterUe adaxial 0.4-0.7 mm diam; ovary
densely short-pilosulous; style very short, the minute stigmaric cavity looking upand
inward; ovules 56-80.
Pod pendulous subcylindric a trifle laterally compressed, bluntly bicarinate by
thickened sutures 0.6-0.7 cm wide, when fully fertile reaching 70 ("-90") x ±2.5