DOGBANE FAMILY 669 



corolla pink; tube about 4 mm. long; lobes reflexed, ovate, obtuse. Hillsides 

 and open woods: Sask. Colo. Ida. Yukon. Plain Mont. 



3. A. pumilum (A. Gray) Greene. Stem 1-5 dm. high, more or less pubes- 

 cent; leaf-blades rounded-ovate, 2-6 cm. long, dark green above, pale and finely 

 pubescent beneath, rounded at the apex, the lower usually truncate or cordate 

 at the base ; calyx-lobes lanceolate, acuminate, 2-3 mm. long; corolla rose-colored; 

 tube 4-5 mm. long; lobes oblong, reflexed, obtuse. A. polycardium and A. griseum 

 Greene. Mountain sides and open woods: Wash. Mont. Utah Calif. Son. 

 Mont. Je-Au. 



4. A. lividum Greene. Stem 1 m. or more high, glabrous, with ascending 

 branches; leaf-blades elliptic-lanceolate or oblong-ovate, 7-10 cm. long, pale 

 green above, glaucous beneath; calyx-lobes lanceolate, acute, 2-2.5 mm. long, 

 whitish, thin; corolla pale flesh-colored or white; tube about 3.5 mm. long; lobes 

 fully 2 mm. long, oblong, obtuse, spreading or reflexed. Mountains: Utah 

 Colo. Submont. Jl. 



5. A. convallarium Greene. Stem tall, 1 m. high or more, glabrous, with 

 ascending branches; leaf-blades glaucous beneath, acute and mucronate at the 

 apex, the lower rounded or subcordate at the base; calyx-lobes lanceolate, pale, 

 acute, about 2 mm. long, corolla white or nearly so; lobes 2 mm. long, oblong, 

 obtuse, spreading. A. vacillans Greene. A. Elmeri Greene. A. occidentals 

 Rydb. Plains and rocky hills: Mont. Wyo. Ariz. Wash. Plain Sub- 

 mont. Je-Jl. 



6. A. ambigens Greene. Stem 3-6 dm. high, glabrous, often tinged with 

 purple above, with ascending branches; leaf -blades thick, dark green above, 

 paler beneath, rounded or sometimes subcordate at the base, 3-6 cm. long; calyx- 

 lobes lanceolate, acute, 2 mm. long, usually purple-tinged; corolla flesh-colored 

 or rose, 4-4.5 mm. long; lobes 2 mm. long, oblong, obtuse, reflexed. River bot- 

 toms and hillsides: Mont. S.D. Colo. Utah Wash. Submont. Mont. Je- 

 Au. 



7. A. macranthum Rydb. Stem 3-4 dm. high, glabrous, with rather 

 spreading branches; leaf -blades thick, dark green above, paler beneath, rounded- 

 ovate, 4-5 cm. long, rounded at the base; calyx-lobes lanceolate, acuminate, 3 

 mm. long, tinged with purple; corolla pink; lobes oblong, reflexed, 3-3.5 mm. 

 long. Copses : Ida. Submont. Jl. 



8. A. cannabinum L. Stem 5-15 dm. high, glabrous, with erect or ascending 

 branches; leaf-blades oblong, lanceolate-oblong or ovate-oblong, light green 

 above, glaucous beneath, usually perfectly glabrous; calyx-lobes lanceolate, 

 acute or acuminate, about 2.5 mm. long; corolla greenish white; lobes ovate, 

 about 1.5 mm. long. Thickets and fields: Anticosti Fla. L. Calif. B.C. 

 Plain Submont. Je-Au. 



9. A. sibiricum Jacq. Stem 3-6 dm. high, glabrous, with ascending 

 branches; leaves oblong, oblong-lanceolate, or oval, 2-8 cm. long, cordate-clasp- 

 ing, rounded or truncate at the base, obtuse or acute and mucronate at the apex, 

 pale green and glabrous; calyx-lobes lanceolate, acute, 2.5 mm. long; corolla 

 greenish white, campanulate; lobes lance-oblong, erect; follicles 5-9 cm. long. 

 A. hypericifolium Ait. A. cervinum Greene. River valleys and hillsides: Ont. 

 Ohio N.M. B.C. Plain Submont. Je-Au. 



FAMILY 106. ASCLEPIADACEAE. MILKWEED FAMILY. 



Perennial herbs or vines, or in warmer climates shrubs, with milky juice. 

 Leaves opposite, whorled, or alternate, without stipules. Flowers perfect, 

 regular, mostly umbellate. Sepals distinct or nearly so, imbricate in bud. 

 Corolla campanulate, urceolate, funnelform or rotate, 5-lobed, the lobes 

 usually reflexed. A 5-lobed crown is usually present between the corolla 

 and the stamens, adnate to either or both. Stamens 5, adnate to the base 

 of the corolla; filaments monadelphous; anthers attached by the base, in- 



