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

302 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [VOL. 35
species wUl be compared to S. skinneri; but this is obviously different in the
shorter leaves (3-11, not 14-26 cm), sohtary periolar gland, shorter style (4.5-7,
not 11 mm) and xeric habitat. AU forms of the polymorphic S. pallida have
characterisric 2-3-flowered racemes and glands at base of the pedicels, these
wanring in S. talpana. No other Mexican or Central American senna bears any
close resemblance to it.
94. Senna guatemalensis (DonneU Smith) Irwin & Barneby, comb. nov. Cassia
guatemalensis Donnell Smith, Bot. Gaz. (CrawfordsviUe) 23: 6.
1897.—Typus infra sub var. guatemalensi indicatur.
Softly woody 1-several-stemmed shrubs at anthesis commonly 0.8-3, in age
somerimes arborescent and up to 5(-6) m taU, with terete, when young blunUy
ribbed hornorinous branchlets densely leafy distaUy, these with lf-stalks, margin
and often dorsal face of lfts, and all axes of inflorescence strigulose, pUosulous
or pUose with subappressed, incurved-ascending or widely divergent, palhd or
lutescent hairs up to 0.3-l(-1.2) mm, the membranous or firmly chartaceous, dull
or sublustrous fohage scarcely bicolored, the Ift-blades olivaceous or rich green
on both faces or sometimes paler beneath, always glabrous above, the vesture of
lower face often reduced to a patch of hairs on proximal side of midrib, the
inflorescence of simple racemes mostly axillary to developed lvs and often shorter
than them, or later ones forming an exserted, leafless or at base depauperately
leafy panicle.
Stipules erect-spreading, narrowly oblong-oblanceolate or oblance-acuminate
or -caudate, straight or incipiently falcate, 8-17 x (0.8-)l-3 mm, the thinly herbaceous
blades early dry deciduous.
Lvs 8-22(-32) cm; petiole including pulvinus 2-7 cm, at middle (0.7-)0.9-2(-2.3)
mm diam, bluntly 3-ribbed dorso-lateraUy, shaUowly open-sulcate ventraUy; rachis
(2.5-)3-18(-21) cm; pulvinules 2-3.5(^) mm; glands (caveat: much eaten) al­
ways at proximal pair of lfts, erect stipitate or subsessile, in profile 1.3-3.5 mm
taU, the lance-ellipsoid acute or fusiform, less often ovoid body 0.4-1.1 mm diam,
simUar but commonly more slender ones sometimes between the second or be­
tween ah pairs; lfts 3-9 pairs, either conspicuously or not at all accrescent distaUy,
the ultimate (or largest) pair varying in outline from broadly obovate obtuse or
emarginate to eUiptic or oblong-elliptic obtuse, or (rarely) ovate or lance-ovate
and deltately acute, 3-7 x 1.3-2.8 cm, 1.5-2.7(-3.7) times as long as wide, at ±
obhque base varying from broadly cuneate to subcordate, the margin plane, the
straight centric midrib immersed or depressed-sulcate on upper face, cariniform
beneath, the (5-)6-ll(-14) pairs of major camptodrome (and often some inter­
calary) secondary nerves either immersed or finely prominulous above, a tertiary
venularion, if any, visible only beneath and not or scarcely raised.
Peduncles 3-10 cm; racemes 6-70-fld, the buds pyramidally crowded above the
open fls, the axis becoming 1-16 cm; fl-buds subglobose, glabrous or often thinly
puberulent; sepals scarcely or weakly graduated, the firm outer ones brownish
obovate 3-5 mm, the broader, thinner-textured, membranous-margined inner
ones 4-6.5 mm; petals yellow fading whitish brown-veined, the 3 abaxial obovate-
cuneate or broadly lanceolate obtuse or the vexUlary one emarginate, the 2 abaxial
either as long or shghriy longer but narrower, mosriy oblanceolate, folded around
the long abaxial stamens, the longest petal 5.5-11.5 mm; androecium glabrous,
the filaments of 4 erect median stamens (1.3-)1.8-2.6(-3) mm, of 3 forwardly
divaricate abaxial ones 2-4(-6) mm, the anthers of 4 median ones oblong, shghUy
curved backward 2-3.5 mm, those of 3 abaxial ones subequal or the central one