Asclepias. ASCLEPIADACE.E. 97 



inches long, 2 to 6 lines broad) : umbels corymbose, densely ni.any-flowered, on peduncles 

 longer than the pedicels : flowers greenish-white, sometimes tinged with purple : corolla- 

 lobes oblong, 2 lines long: hoods broadly ovate, entire, shorter than the anthers, exceeded 

 by the stout-subulate incurved horn. — Cav. Ic. i. 42, t. 58; Gray, Proc. Am. Acad. xii. 71. 

 A.fasdcidarls, Decaisne in DC. Prodr. viii. 5G9 ; Gray, Bot. Calif, i. 475. A. macrophijUa, 

 Nutt. PI. Gamb. 180. — Dry or moist ground, Oregon and California, to Nevada and 

 Arizona. (Mex.) 

 A. verticillata, L. Stems a foot or two In'gh, slender, very leafy : leaves mostly in 

 whorls of '■) to G, or some scattered, filiform-linear and with revolute margins (2 to 4 inches 

 long) : umbels numerous, small, many-fiowcred, on peduncles longer than the pedicels : 

 corolla greenish-white ; the lobes oblong, 2 lines long : hoods white, broadly ovate and 

 entire, with somewhat auriculate involute base, barely equalling the anthers, much shorter 

 than their elongated-subulate falcate-incurved horn. — (Pluk. Aim. t. 330.) Hook. Fl. 1. 144 ; 

 Lodd. Cab. t. 1067 ; Sweet, Brit. Fl. Gard. t. 144 ; Decaisne, 1. c. (excl. var. Unifoliu) ; Torr. 

 Fl. N. Y. t. 87. A. i/n/iui(Ics, IIBK. Nov. Gen. & Spec. iii. 188. — Dry soil, Canada to 

 Nebraska and soutli to Florida, Texas, and New Mexico. (Mex.) 



Var. pumila, Gray, 1. c. A span or more high, many-stenmied from a fascicled root : 

 leaves much crowded, filiform ; peduncles seldom longer than the pedicels. — Dry plains, 

 Nebraska to Kansas and New Mexico. 



Var. SUbverticillata, Gray, 1. c. Stems single, 1 to 2i feet high : leaves all oppo- 

 site or barely in threes, o to 5 inches long, 1 to 3 lines wide, flatter, the margins less or 

 little revolute : horns sometimes rather less exserted. — A. verticillata, var. galioides, Torr. 

 Bot. Mex. Bound. 164, chiefl^^ hardly of Decaisne. A. linearis, Scheele in Linn. xxi. 758. 

 A. verticillata, var. liidfoUa, Engehn. ined., but not A. linifolia, HBK. (which may rather 

 be A. virijuta, Balb.),nor of Decaisne, 1. c, whicli seems to be a mixtui'e of two or three 

 species. — W. Texas and New Mexico. (Adjacent Mex.) 



A. LixARiA, Cav., with the aspect of the foregoing, has the horn short and nearly in- 

 cluded in the hood, a very short column, and turgid-ovate follicle arrect on the deflexed 

 pedicel : enumerated in Torr. Mex. Bound. 1. c, from Northern Mexico, but not yet found 

 very near the U. S. boundary. 



2. Column manifest, but not liiglicr than broad. 

 A. quinquedentata, Gray. A span or two high : leaves all opposite, narrowly linear 

 and elongated, resembling those of .4. verticillata, var. snhi-erticillata : umbels 4-10-flowered : 

 peduncle longer than the pedicels : lobes of the greenish-white corolla oval, 2i or 3 lines 

 long: hoods white, about the length of the anthers, eonduplicate, somewhat quadrate in 

 outline, the keeled back ending below in a truncate salient base, the truncate summit 

 prominently and acutely 5-toothed ; horn adnate up to the summit, falcate, ending in a 

 small acute dorsal tooth and in an inflexed and moderately exserted subulate proper apex. 

 — Proc. Am. Acad. xii. 71. A. verticillata, var. r/alioirles, Torr. 1. c. in part. — Prairies or 

 rocky hills on the San Pedro River, W. Texas, Wri;/ht (1680). Fruit unknown; but, 

 according to Engelmann, it may be arrect on a decurved pedicel, as in A. Linaria. 

 A. angustifolia, Ell. Minutely puberulent, or the foliage glabrous : stems a span to a 

 foot long, decumbent or ascending, very leafy : leaves irregularly alternate or the lower 

 opposite, narrowly linear [U to 4 inches long, 1 to 3 lines wide), the margins little if at all 

 revolute : umbels 1 to 3, terminal, many-flowered : peduncle usually nnich longer than the 

 pedicels : lobes of the greenish corolla oval, barely 2 lines long : hoods (purplish, " nearly 

 orange-colored," Ell.) ovate, entire, considerably surpassing the anthers, longer than the 

 broad subulate horn, which is inflcxed-exserted from tlie middle. — Sk. i. -32.5. A. tu1>ernsa ? 

 Walt, fide Ell. A. hm^/i folia, Michx. herb., in part. A. Michaimi, Decaisne, 1. c. 569 ; Chapm. 

 Fl. 365. (Elliott's name was publislied in 1817, earlier than the homonyms.) — Low pine 

 barrens and sand-hills, S. Carolina to Florida. 

 A. viridula, Chapm. Nearly glabrous : stem slender, erect, a foot or two high : leaves 

 all opposite, narrowly linear or (when with revolute margins) filiform, erect or ascending 

 (1 to 3 inches long), surpassing the short-peduncled 5-12-flowered umbels: lobes of the 

 yellowish-green corolla oblong, 2 lines long : hoods oblong, one third longer than tlie an- 

 thers, the margins with an auriculate incurved tooth below the middle, otherwise entire, 

 longer than the subulate incurved horn. — Fl. 362. — Wet pine barrens near Apalachicola, 

 Florida, Chapimtn. 



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