CASSIACEAE 583 
lets 30-70, the blades oblong, 3-4 mm. long, obtuse or acutish, merely ciliolate, not prom- 
inently nerved : stipules ovate : peduncles commonly shorter than the subtending bracts or 
longer at maturity: spikes globose or nearly so, about 1 cm. in diameter: pods oblong, 
2-3 em. long, narrowed into stipes only 2-4 mm. long. 
In dry soil, southern Texas and tropical America. Spring to fall. 
3. Neptunia Lindheimeri Robinson. Stems branched at the base, the branches dif- 
fuse, persistently pubescent, several dm. long: leaves with 6-10 pinnae, leaflets 30-60, 
the blades conspicuously ciliate and pubescent on the lower surface, blunt or mucronulate : 
eduncles becoming 2.5-6.5 cm. long: pods oblong and cuneate at the base, 2.5-3.8 cm. 
ong, permanently pubescent, the stipes 4-5 mm. long : seeds 3-10. 
-On prairies, Texas. Spring and summer. 
4. Neptunia Floridana Small. Stems several from large roots, ascending or spread- 
ing, 3-7 dm. long, sparingly pubescent or glabrate, commonly branching, more or less 
roughish pubescent: leaves rather numerous, with 3-5 pairs of pinnae: stipules lanceo- 
late, acuminate ; leaflets numerous, the blades oblong or narrowly oblong, 4-5.5 mm. long, 
often mucronulate, ciliate, prominently 3-nerved, sessile: peduncles slender, much longer 
than the subtending leaves: spikes oval or oblong, 1-1.5 em. long: pods oblong, 2.5-3.5 
em. long, apiculate, rather lustrous, glabrous, the stipe 2-4 mm. long: seeds 5-10. 
In sand, Florida to Louisiana. Spring to fall. 
13. PROSOPIS L. 
Shrubs or trees, often armed with axillary spines. Leavesalternate: blades 2-pinnate, 
with four pinnae : leaflets narrow, relatively few. Flowers perfect, in green or yellowish 
cylindric spikes. Calyx 5-lobed, sessile. Corolla of 5 distinct or slightly united petals. 
Stamens 10: filaments distinct. Ovary often stipitate. Ovules numerous. Pods in lax 
clusters, flattened, straight or slightly curved, indehiscent, the interior tissues more or 
less spongy. 
_ 1. Prosopis glandulósa Torr. A shrub or tree sometimes 15 m. tall, usually with 
zigzag branches, mostly armed with thorn-like spines. Leaves with 2-4 pinnae, long- 
petioled ; leaflets 12-60, the blades linear or nearly so, 1.5-4 cm. long, obtuse or acutish : 
peduncles 5-10 mm. long: spikes 4-8 cm. long: calyx campanulate, about 1 mm. high; 
lobes triangular, slightly shorter than the tube: petals erect, linear or nearly so, 4-5 times 
longer than the calyx, acute, pubescent within : stamens hardly twice as long as the petals: 
ovary pubescent : pods linear, 1-2 dm. long, straight or nearly so: seeds oblong. 
In plains or prairies, Kansas to Texas, Arizona and Mexico. 
14. STROMBOCARPA A. Gray. 
Shrubs or trees, with axillary spines. Leaves alternate: blades 2-pinnate, short- 
petioled or sessile, with few pinnae: leaflets relatively few. Flowers perfect, in cylindric 
pd globular spikes. Calyx 5-lobed, campanulate or turbinate. Corolla of 5 distinct or 
slightly united petals. Stamens 10: filaments distinct. Ovules numerous. Pods in dense 
clusters, each tightly coiled into a spiral, woody without, pulpy within. 
1. Strombocarpa cineréscens A. Gray. A low shrub, armed with slender spines. 
Leaves with 2-4 pinnae, sessile or short-petioled ; leaflets 10-20, the blades crowded, 1.5-3 
mm. long, obtuse, reticulated: peduncles 1-3 em. long: heads globose, 1-1.5 cm. in 
diameter: calyx turbinate, nearly 2 mm. high: petals linear, fully twice as long as the 
calyx : pods 1.5-4 em. long, spirally twisted into a cylinder 5-7 mm. thick. 
In moist soil, along or near the lower Rio Grande, southern Texas and Mexico. 
FAMILY 16. CASSIACEAE Link. SENNA FAMILY. 
,, Trees, shrubs or herbs, sometimes prickle-armed. Leaves alternate, usually 
with stipules: blades simple or compound. Flowers mostly perfect, sometimes 
polygamous, monoecious or dioecious, variously disposed, regular or irregular. 
Calyx of 5 more or less united sepals. Corolla of usually 5 petals, imbricated, the 
upper one enclosed by the lateral ones in the bud. Androecium of 10 stamens 
or fewer. Filaments distinct or united. Gynoecium of a single carpel. Ovary 
l-celled, sometimes stipitate. Style terminal. Ovules 1-many. Fruit a 
legume, 2-valved or indehiscent. Seeds with or without endosperm. 
