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; 

 tube4— 5 mm. long; lobes oblong, reflexed, obtuse. A. polycardium and A. griseum 

 Greene. IMountain 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. occidentale 

 Rydb. Plains and rocky hiUs: Mont. — Wyo. — ^Ariz. — Wash. Plain — Sub- 

 jHont. Je-Jl. 



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

 purple abovCj 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^ 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, hght green 

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

 acute or acmninate, 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; cahTc-lobes lanceolate, acute, 2.5 mm. long; coroUa 

 greenish white, campanulate; lobes lance-oblong, erect; foUicles 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 lOG. 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, mostlj^ umbellate. Sepals distinct or nearl}^ so, imbricate in bud. 

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

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

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

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



