504 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
114, APOCYNACEAE. Doghane Family. 
Perennial herbs with milky sap; leaves opposite or alternate, sessile or short- 
petiolate, simple, usually entire, exstipulate; flowers perfect, regular, in terminal 
cymes; calyx 5-parted, persistent; corolla 5-parted; stamens as many as the corolla 
lobes and alternate with them, inserted in the tube or throat of the corolla; anthers 
linear-oblong, sagittate, 2-celled; ovary superior or partly inferior, of 2 distinct carpels; 
fruit of paired follicles; seeds often comose. 
KEY TO THE GENERA. 
Leaves alternate; anthers free from the stigma; corolla 10 mm, 
long or more, tubular or funnelform................... 1. Amsonta (p. 504). 
Leaves opposite; anthers converging about the stigma and 
slightly adherent to it; corolla 3 to 5 mm. long, short- 
campanulate or urceolate............................ 2. APOcYNUM (p. 605), 
1. AMSONIA Walt. 
Herbaceous perennials, sometimes woody at the base, with alternate entire narrow 
leaves and tubular or salverform flowers in terminal cymes; calyx lobes 5, acuminate; 
disk wanting; corolla 1 cm. long or more, the tube narrow below, slightly enlarged 
above, villous within; stamens included, not appendaged; carpels 2, connected by 
the slender styles; stigma appendaged by a reflexed membrane; follicles erect, several- 
seeded, the seeds not appendaged. 
KEY TO THE SPECIES. 
Stems and leaves glabrous. 
Pods constricted between the seeds; corolla tube about 1 cm. 
long... 2.2 1. A. brevifolia, 
Pods continuous, not constricted; corolla tube 3 to 4.em, long.... 4. A. longiflora, 
Stems and leaves variously pubescent. 
Pods constricted between the seeds; plants tomentose.......... 2. A. arenaria. 
Pods continuous, not constricted; plants hirtellous............. 3. A. hirtella. 
1. Amsonia brevifolia A. Gray, Proc. Amer, Acad. 12: 64. 1876. 
Type Locauity: ‘‘S, Utah and W. Arizona, to the border of California.”’ 
Range: Southern California to Utah and northwestern New Mexico. 
New Mexico: Zuni (Stevenson 53). Dry soil, in the Upper Sonoran Zone. 
2. Amsonia arenaria Standlay, Proc. Biol. Soc. Washington 26: 117. 1913. 
Tyre Locatity: Sandhills between Strauss and Anapra, near the southeast corner 
of Dona Ana County, New Mexico. Type collected by Elmer Stearns (no. 372). 
RanGeE: Southern New Mexico to northern Chihuahua. 
New Mexico: Between Strauss and Anapra; San Andreas Mountains. Sandhills, 
in the Lower Sonoran Zone. 
3. Amsonia hirtella Standley, Proc. Biol. Soc. Washington 26: 118. 1913. 
Type Locauity: Near the Upper Corner Monument, southern Grant County, New 
Mexico. Type collected by E, A. Mearns (no. 117). 
Range: Western Texas and southern New Mexico to Chihuahua. 
New Mexico: Grant County (Mearns 117). Dry hills, in the Lower Sonoran Zone. 
4. Amsonia longiflora Torr. U.S. & Mex. Bound. Bot. 159. 1859. 
Type Locatity: ‘Rocky ravines near El Paso,’’ Chihuahua or Texas, 
Rance: Southern New Mexico and western Texas to northern Mexico. 
New Mexico: Rio Gila ( Wooton). 
The specimen is in fruit only, but it has the leaves and the glabrous stems of this 
species. 
