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

1982] CASSIINAE—SENNA 101
duction of all three abaxial anthers to sterile flasks narrower and shorter than iht
four median ones. Strongly nerved sepals (S. macrophylla) and cauhflory (S.
ruiziana, S. sandwithiana), however, both occur infrequently in ser. Bacillares,
and in one member of that group (S. hayesiana) the three abaxial stamens are
completely suppressed. The forming pod suggests close affinity in the same di­
rection; we suppose when ripe it becomes a linear subterete bean such as alone
could accommodate the very numerous, early biseriate ovules. Thus everything
agrees with ser. Bacillares except the incongruous fohage.
7. Senna troHiiflora Irwin & Barneby, sp. nov., signis jam supra sub serie mono-
typica Trolliifloris expositis ab omnibus distinctissima.—ECUADOR.
Napo: secondary forest, Napo road, Limoncocha, III. 1970 (fl, fr jun),
Robert N. Mowbray 7(?i66.—Holotypus, TENN = NY Neg. 9452;
isotypi, MO, NY.
Amply leafy trees ±3.5 m with terete striate glabrous older stems and strongly
angulate hvid-pustulate subglabrous annotinous branchlets, the elongate plurifo­
liolate lvs bicolored, the thinly chartaceous lfts dull olivaceous above, pallidly
olivaceous beneath, densely minutely strigulose on both faces with appressed
hairs 0.05-0.15 mm, the inflorescence a condensed leafless cauliflorous panicle
of few-fld racemes subappressed-pUosulous with incumbent hairs to 0.2-0.3 mm,
the fls themselves little expanding, subglobose.
Stipules caducous from minutely raised (but not spurhke) scars, those of de­
veloped lvs not seen, some subtending reduced If-stalks subulate 2-3 m.
Larger lvs 2-3.8 dm; petiole 4-5 cm, including the deeply wrinkled pulvinus
4-5 cm, at middle 1.8-2.3 mm diam, like each segment of rachis rounded dorsally,
2-ridged and openly shallow-sulcate ventrally; rachis 1.6-3.3 dm, the segments
between lfts 1.5-3 cm, shorter upward; glands between all pairs of lfts ascending
short-stipitate, in profile 1.5-1.8 mm tall, the body slenderly oblong- or clavate-
cyhndroid or compressed-linguiform 0.4-0.9 mm diam; pulvinules ±2.5 mm; lfts
(of major lvs) 8-12 pairs, slightly accrescent upward, symmetrically oblong-ellip­
tic or (distally) -oblanceolate, deltately acute mucronulate, at scarcely oblique
base either broadly or narrowly cuneate-decurrent on pulvinule, the margin re­
volute, the straight centric midrib on upper face immersed, on lower cariniform,
the 6-9 major (with some intercalary) secondary veins and the irregular tertiary
venulation weakly prominulous on both faces.
Racemes 3-7-fld, the axis including short peduncle \-4 cm; bracts ovate-elliptic
concave, densely strigulose dorsally, caducous as the pedicel begins to elongate;
fertUe pedicels becoming 3.5-5.2 cm; fl-buds globose densely strigulose-pilosulous;
sepals firm brownish with pallid submembranous ciUolate margins, coarsely
7-9-nerved from base and reticulate distally, Uttie graduated in length, broadly
obovate-oblong to -suborbicular 15-17 x 10-16 mm, permanently imbricate by
lateral margins, almost or fully enclosing the coroUa; petals yellow, coarsely
venulose, puberulent on both faces, short-clawed, obovate-cuneate 13-17 mm,
the banner a little longer and wider than the rest; androecium functionally
7-merous, the 3 spatulate staminodes ±2.5 mm, the filaments ofthe fertUe mem­
bers strigulose, those of 4 median stamens greatly thickened 3 mm, of 3 abaxial
ones stoutly linear 3.5 mm, the 4 median anthers stoutly oblong, slightly incurved,
9-10.2 mm, with divaricate 2-porose beak ±0.6 mm, the 3 abaxial anthers much
smaUer, flask-shaped, the body 4-4.5 mm, the erect 1-porose beak 2-2.4 mm;
ovary densely strigulose, the style clavately dilated and 1.5 mm diam just below
the introrse stigma; ovules ±210.