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. 



CauUne leaves broadly oblong, clasping, obtuse 5. A. hy per h-ifol turn. 



Cauline leaves narrower, petioled, acute, bright green. 

 Leaves rounded or obtuse at the base, oblone: to 



elliptic-oblong 6. A. vlride. 



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

 tic-lanceolate 7. A. angustifolium. 



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

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



Rangb: Washington and Montana to California and New Mexico. 



Xi.w Mexico: Baton; White Mountains. Mountains, in the Transition Zone. 



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



190G. 



Typi: i.ui -m.itv: Colorado. 



Range: British America to Colorado and New Mexico. 



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

 Mountains; Lookout Mines; Turkey I reek; White and Sacramento mountains. < >p< n 

 slopes in the mountains, in the Transition Zone. 



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



Apocynum cannabinitm lividum A. Nels. in Coulter, New Man. Rock) Mount 386. 



1909. 

 Tvi'i: locality: "Common on railway embankments in Black Canon," Colorado. 

 Range: Mountains of Colorado and northern New Mexico. 



Nkw Mi hco: Sierra Grande (8tandley 6195). Transition Z 



Professor Nelson's n luction of this species to rank as a sub i 9 of A oatma- 



hlntiiii is peculiarly unfortunate, since the two plants are nol ■ Loeely related. 



