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

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

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

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1982] CASSIINAE—INTRODUCTION<br />

1. Filaments of all stamens straight or simply incurved and either shorter than or not over<br />

twice as long as their anther, if 3 abaxial ones longer than the rest these 2 antepetalous with<br />

1 antesepalous between them, and the anthers in any case terminally dehiscent by slit or<br />

pore; pedicels either bracteolate or ebracteolate, but if bracteoles present these (with extremely<br />

rare exce<strong>pt</strong>ions) inserted above or near middle of pedicel and the pod then elastically<br />

dehiscent; pod various, but if resembling that of Cassia the pedicels ebracteolate; funicle<br />

and seed variable; extrafloral nectaries common but not universal.<br />

2. Bracteoles 0; pod either indehiscent or inertly dehiscent through 1 or both sutures, if<br />

through one only then follicular, if through both then the valves tardily separating but<br />

not coiling, or (infrequently) the valves breaking up into 1-seeded joints; androecium<br />

commonly zygomorphic, the stamens tending to dwindle from abaxial to adaxial side of<br />

the fl, the 3 adaxial members commonly staminodal, but sometimes all 10 subequal<br />

fertile; an ther-thecae naked along the sutures; extrafloral nectaries (when present)<br />

mounded, claviform or phalloid, secreting nectar from a convex surface; funicle filiform;<br />

seed-coat either smooth or minutely rugulose but not pitted, often charged on each face<br />

(or on margin) with a closed areole; trees, woody vines, shrubs, herbs; all continents<br />

and Oceania, a few extratropical. Senna {p. 64).<br />

2. Bracteoles 2; pod elastically dehiscent, the valves coiUng; androecium (suberratically)<br />

actinomorphic, the 2 cycles of stamens bearing anthers of different lengths but never<br />

zygomorphically dwindhng from abaxial to adaxial side of fl; anther-thecae ciliolate along<br />

the sutures; extrafloral nectaries, when present, dish- or cup-shaped, rarely flat, secreting<br />

nectar from a concave (flat) surface; funicle deltately dilated; seed-coat either smooth or<br />

pitted, but exareolate; all continents and Oceania, but primarily American, one section<br />

{Chamaecrista) highly differentiated also in Africa, less so in Asia, Australia and the<br />

Pacific, a few extratropcal in both Old and New World. Chamaecrista (p. 636).

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