82 APOCYNACE^. Amsonia. 



2 or 3 lines long, fully half the length of the tube ; orifice bearded : mass of the stigma 

 between the ring and the lobes broader than high : follicles as in the preceding 1 — Frem. 

 Rep. ed. 2, 316, & Bot. Mex. Bound. 158. — Sandy plains and ravines, W. border of Texas 

 to S. Utah, Fremont, Wright, Mrs. Thompson, &c. 



# # Follicles slender and continuous : 1 ube of the corolla much longer than the lobes. 



A. Palmeri, Gray. Glabrous or nearly so, a foot or two high : leaves narrowly lanceo- 

 late or linear, sessile ( 1-J- to 3 inches long) : clusters simple and few-flowered : lobes of the 

 white corolla ovate, 1$ to 2 lines long, about a quarter the length of the tube, which is 

 reflexed-bearded within almost to the base : mass of the stigma didymous, puberulent, di- 

 vided almost down to the ring. — Proc. Am. Acad. 1. c. — Arizona, Palmer. 



A. longifiora, Torr. Minutely scabrous or even scabrous-pubescent, or above glabrous : 

 leaves linear, sessile (■£ to 2 lines wide, 1 to 2 inches long) : lobes of the corolla narrowly 

 oblong, white, a quarter the length of the greenish-purple clavate tube ; this over an inch 

 long and glabrous within except toward the summit : body of the stigma trochleate, much 

 longer than wide, surmpunied by the small and short lobes. — Bot. Mex. Bound. 159. — 

 Rocky ravines, W. Texas and New Mexico on the Rio Grande, and adjacent Mexico. 



3. VlNCA, L. Periwinkle. (Ancient Latin name, of obscure meaning.) 

 — Flowers handsome, usually axillary. Juice hardly milky. — Two distinct sub- 

 genera: § 1. Pervinca ; herbaceous and procumbent or creeping Old World 

 species, blue-flowered, anthers with wide connective, and carpels only 6-8-ovuled ; 

 includes V. minor, L., v the common Periwinkle of the gardens and the related 

 species. § 2. Lochnera, A.DC. ; low and erect shrubby plants, with white or 

 rose-colored corolla, anthers with narrow connective and carpels several-seeded ; 

 represented by the following species. 



V. rosea, L. Low erect shrub, puberulent: leaves oblong, short-petioled : flowers almost 

 sessile : tube of corolla an inch long, the narrowly dilated upper portion with a necta- 

 riferous pit (externally salient) behind each anther; the throat with a hairy ring over the 

 tips of the stamens and a slighter one at the narrow orifice ; lobes obovate, shorter than 

 the tube, white with a pink eye, sometimes all rose-color or white, showy. — Bot. Mag. 

 t. 248. — Lochnera vincoides, Reichenb. — S. Florida : possibly native. "Widely distributed 

 as a weed in the tropics ; cult, as a house-plant. (Trop. Amer.) 



4. HAPL.6PHYTON, A.DC. (Composed of anloog, simple, and qvxov, 

 plant, alluding to the want of calycine glands and disk.) — DeCandolle was not 

 aware of the double coma, and Benth. & Hook. (Gen. ii. 722) wrongly assign to 

 it adnate anthers with empty tails, referring it to the EcMtidece. Single species. 



H. cinaicidum, A.DC. Herbaceous or nearly so from a suffrutescent base, slender, a 

 foot or two high, branching, somewhat cinereous-puberulent : leaves hispidulous-scabrous, 

 opposite and alternate, lanceolate or ovate-lanceolate, short-petioled, an inch or two long : 

 flowers terminating the branches, short-peduncled : corolla sulphur-color, half inch or more 

 long ; the lobes as long as the tube. — Prodr. viii. 412 ; Torr. Bot. Mex. Bound. 159. — S. 

 Arizona, in crevices of rocks, Wright, Schott, Thurber. (Mex., Guatemala, Cuba.) 



5. AP6CYNUM, Tourn. Dogbane, Indian Hemp. (Ancient Greek 

 name for Dogbane ; dno, far from, xvav, dog.) — Perennial herbs (of northern 

 temperate zone), pale or glaucescent ; the liber very tough-fibrous ; and the leaves 

 opposite, oval or oblong, mucronate-tipped. Flowers (in summer) small, in ter- 

 minal minutely subulate-bracteate cymes, white or rose-color. Follicles 2 to 7 

 inches long, slender-pointed, often deflexed. 



A. androssemifolium, L. A foot to a yard high, glabrous, or rarely soft-tomentose, 

 branched above : branches widely spreading : leaves ovate or roundish, distinctly petioled : 



