WOOTON AND STANDLEY — FLORA OF NEW MEXICO. 505 



2. APOCYNUM L. Dogbane. 



Perennial herbs with reddish or greenish stems, 1.5 meters high or less, with tough 

 fibrous bark and opposite nucronate entire leaves; flowers small, pinkish or greenish 

 white, in terminal cymes; calyx small, deeply 5-parted, adnate to the ovary by a 

 thickish disk; corolla short-campanulate or urceolate, the limb erect or spreading, 

 5-lobed, bearing appendages within alternate with the 5 included stamens; filaments 

 short, the anthers sagittate; fruit a pair of follicles, terete or long-fusiform; seeds 

 numerous, with a coma at the apex. 



KEY TO THE SPECIES. 



Corolla 5 mm. long or more, its lobes spreading; leaves ovate; 

 low plants with spreading branches and bright pink 

 flowers. 



Leaves glabrous beneath; sepals narrowly lanceolate 1. A. ambigens. 



Leaves pubescent beneath; sepals narrowly or broadly lan- 

 ceolate. 

 Sepals broadly lanceolate; corolla open-campanulate; 

 leaves thick, dark green, decidedly pubescent 



beneath 2. A. scopulorum. 



Sepals narrowly lanceolate; corolla narrowly campanu- 

 late; leaves pale green, pubescent only on the 



petioles and veins 3. A. lividum. 



Corolla 3 mm. long or less, with erect lobes; leaves oblong to 

 narrowly elliptic-oblong; tall plants with erect or strongly 

 ascending branches and pale flowers. 



Leaves pubescent beneath 4. A. laurinum. 



Leaves glabrous. 



Cauline leaves broadly oblong, clasping, obtuse 5. A. hyperid/olium. 



Cauline leaves narrower, petioled, acute, bright green. 

 Leaves rounded or obtuse at the base, oblong to 



elUptic-oblong 6. A. viride. 



Leaves acute at the base (on longer petioles), ellip- 

 tic-lanceolate 7. A. angusti folium. 



1. Apocynum ambigens Greene, PI. Baker. 3: 17. 1901. 

 Type locality: "In the Black Canon," Colorado. 



Range: Washington and Montana to California and New Mexico. 



New Mexico: Raton; ^Tiite Mountains. Mountains, in the Transition Zone. 



2. Apocynum scopulorum Greene; Rydb. Colo. Agr. Exp. Sta. Bull. 100: 269. 



1906. 



Type locality: Colorado. 



Range: British America to Colorado and New Mexico. 



New Mexico: Chama; Santa Fe and Las Vegas mountains; Sierra Grande; Sandia 

 Mountains; Lookout Mines; Turkey Creek; T\Tiite and Sacramento mountains. Open 

 elopes in the mountains, in the Transition Zone. 



3. Apocynum. lividum Greene, PI. Baker. 3: 17. 1901. 



Apocynum cannahinum lividum, A. Nels. in Coulter, New Man. Rocky Mount. 386. 



1909. 

 Type locality: "Common on railway embankments in Black Canon," Colorado. 

 Range: Mountains of Colorado and northern New Mexico. 

 New Mexico: Sierra Grande (5ta?ic?fe?/ 6195). Transition Zone. 

 Professor Nelson's reduction of this species to rank as a subspecies of A. canna- 

 hinum is peculiarly unfortunate, since the two plants are not closely related. 



