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minal and lateral, short-peduncled or sessile: flowers purplish or greenish; hoods 
with ovate erect base as long as the anthers, above contracted into a gradually atten- 
uate twice longer subulate spreading portion with incurving apex; the broad horn 
short and blunt, with barely exserted apex: pods ovate-lanceolate, 2.5 cm. long.— 
Rocky hills along the Rio Grande, extreme western Texas. 
11. A. quinquedentata Gray. Glabrous: leaves narrowly linear and elongated: 
umbels 4 to 10-flowered: corolla-lobes greenish-white; hoods white, about as long as 
the anthers, somewhat quadrate, the keeled back ending below in a truncate salient 
base, the truncate summit prominently and acutely 5-toothed; the horn falcate, 
adnate up to the summit, and with an inflexed moderately exserted subulate apex: 
pods slender-fusiform, 10 cm. long.—Prairies and rocky hills, western Texas. 
d. Leaves from ovate to oblong, mostly pubescent or puberulent: hoods obtuse, entire, 
twice or thrice the length of the anthers. 
12. A.nyctaginifolia Gray. Roughish-puberulent: leaves rhombic-ovate, 5 to 7.5 
em. long, rather long-petioled: umbels all lateral, very short-peduncled, 4 to 20-flow- 
ered: corolla-lobes greenish; hoods laterally much compressed, mainly solid, with a 
narrow dorsal keel and a broader ventral wing, the latter bearing 2 lamella, its broad 
upper part inclosing a crest which bears a short subulate exserted horn: pods short, 
ovate, cinereous-puberulent,—Extending from western Texas to southeastern Cali- 
fornia. 
++ ++ Pods and fruiting pedicels erect: leaves often whorled: glabrous or nearly so. 
13. A. perennis Walt. Stems 3 to 6 dm. high, persistent or somewhat woody at 
base: leaves lanceolate or lanceolate-ovate, tapering to both ends, thin, rather slen- 
der-petioled, 5 to 10 cm. long: flowers white, small; the small hoods shorter than the 
needle-shaped horn.—Extending from the Atlantic region to western Texas, where 
var. PARVULA Gray also occurs, which is barely 3 dm. high and with leaves 2.5 to 5 
em. long. 
14. A. verticillata L. Stems slender, very leafy to the summit: leaves filiform- 
linear, with revolute margins, 5 to 7.5 cm. long, 3 to 6in a whorl: umbels small: 
corolla-lobes greenish-white; hoods about half the length of the incurved claw- 
shaped horns.—A dry soil species of the Atlantic region, extending through Texas to 
New Mexico and Mexico. In southern and western Texas there also occurs var. sUB- 
VERTICILLATA Gray, with leaves all opposite or barely in 3s, 7.5 to 12.5 em. Jong, flat- 
ter, the margins less or little revolute. 
* * Hoods long-stipitate, their stalks adnate to anther-column, exceeding the anthers ; the 
crest-like process adnate to the nearly open-toothed blade: anther-wings broader and 
somewhat angulate about the middle. 
15. A. longicornu Benth. More or less pubescent: leaves all opposite, from ovate 
to oblong-lanceolate, obtuse, 5 to 10 cm. long, petioled: flowers yellowish-green: 
pods erect on the deflexed pedicel. (4. Lindheimeri Eng. & Gray.)—Throughout 
southern and western Texas, 
*** Hoods scssile, with a minute horn exserted from the 2-lobed apex: anther-wings 
broadly rounded at base and conspicuously auriculate-notched just above it. 
16. A. stenophylla Gray. Puberulent, but foliage glabrous: stems slender, 3 to 
6 dm. high: leaves narrowly linear (7.5 to 17.5 cm. long, 2 to 5 mm. wide), upper 
alternate, lower opposite: umbels 10 to 15-flowered: corolla-lobes greenish; hoods 
whitish, equaling the anthers: pods erect on ascending pedicels.—Dry prairies, 
northern Texas. 
4. ACERATES Ell. (GREEN MILKWEED.) 
Nearly as in Asclepias, but hoods destitute of crest or horn.—Leaves 
opposite or irregularly alternate, short-petioled or sessile; greenish 
flowers in compact many-flowered umbels; pods smooth and slender. 
