cuscuTACEAE (doddek familV) 389 



(3-8) few-flowered umbels: flowers lurid-purplish: hoods only half the length 

 of the anthers, erept, stroilgly aingulate-toothed at the front; the tip' of the 

 erect subulate horn exserted. — ^Dry sandy soil; from Wyoming and Colorado 

 to Arizona and Texas. 



9. Asclepias verticillata L. 1. c. 217. Stems 3-6 dm. high, slender, very 

 leafy: leaves mostly in whorls of 3-6, or some scattered, flKformi-Knear, with 

 re volute margins: umbels numerous, small,_ many-flowered, on peduncles 

 longer than the pedicels: corolla greenish-wmte; hoods white, broadly ovate 

 and entire, with somewhat aiuiculate involute base, barely equaling the 

 anthers, much diorter than their elongated-subulate, falcate-incurved horn.- — 

 In dry soil; froia New Mexico and Colorado to 'Nebraska, and eastward across 

 the continent. 



10. Asclepias galioides H.B.iK. Nov. Gen. & Sp. 3: 148.. 1815. Glabrous, 

 except the minutely pubescent stems and pedicels; stems erect, 3-5 dm. high 

 from a horizontal rootstock: leaves erect or spreading, in whorls bf 2-6, nar- 

 rowly linear, 5-8 cin. long, the margins revolute: peduncles longer than the 

 pedicels and shorter than the leaves; umbels 19-26 mm. in diameter; flowers 

 greenish-white: corolla^segments 4 mm. long; hoods as high as the anthers, 

 broadly rounded at the summit, dorsally hastatersagittate, the ventral mar- 

 gins shghtly involute, entire; horn arising from the base of the hood, long- 

 exserted over the anthers: anther-wings minutely notched ^t the base: folS- 

 cles' erect on erect fruiting pedicels, attenuated, 5-7 cm. long, glabrous or 

 nearly so. — ^Kansas to Colorado, Arizona, and Mexico. 



It. AscIepiaspumila(Gray),yail, inBrit. andBr. Fl. 3: 12. 1898. Stems 

 4-25 cm. high, tufted, from a woody root: leaves numerous, crowded, some- 

 times obscurely whorled,, fiUform-linear, 2.5-5 cm. long, smooth; or minutely 

 roughened, the margins revolute:, umbels 2-several,short-peduncled, few- 

 flowered; pedicels filiform, puberule^nt, 6-9 mm. long: corolla greenish-white, 

 its segments oblong, 3-4 mm. long; hoods white, erect, oblong, entire, equal- 

 ing the anthers, shorter than the slender iiicurved horn: follicles erect, on 

 erect fruiting pedicels, narrowly spindle-shaped, 3^5 cm. long, finely puberu- 

 lent.— Dry plams; South Dakota and Wyoming to Arkansas and New Mexico. 



3. ASCLEPIODORA Gray 



Low and stout perennial herb, often decimibent. Flowers large. Corolla- 

 lobes ovate, greenish. Follicles usually bearing some scattered, soft-spintilose 

 projections, on recurved or sigmoid pedicels.' Distinguished frofia Asclepias 

 by the hood bearing a crest instead bf a horn. 



1. Asclepiodora decumbens (Nutt.) Gray, Proc. Am. Acad. 12: 66. 1876- 

 Scabrous-puberulent: leaves lanceolate to linear, tapering to the apex: umbels 

 solitary: corolla depressed-globular in bud, hardly twice the length of the 

 yellowish or dark purplish hoods, which overtop the somewhat depressed 

 anther-column: anther-wings salient, especiaiUy, at the broader and strongly 

 angulate upper portion; polUnia pear-shaped, short-caudicled.^-From Utah 

 through Colorado: and New Mexico ,to Texas and Arkansas. , , , > 



96. CUSCUTACEAE Dumort. Dodder Family 



Parasitic plants with slender, thread-like, yellowish or reddish stems which 

 twine dextrorsely about the vegetative organs of the host plant and invade 

 its tissues by means of suckers. Leaves and bracts reduced~to small scales 

 of the same color as the stems. Flowers small, cymose-clustered, mostly 

 white, 5 (rarely 4)-merous. Cal^ cleft or parted. Corolla globular, lU'n-shaped, 

 bell-shaped, or somewhat tubular; Stamens inserted in the throat of the 

 corolla above as many scale-like crenulatfe"' or lacerate appendages. Ovaty 



