S76 CONVOLVULACEAE 



■ 



5-15 cm. long, acute, entire; sepals ovate or orbicniar-ovate, 5-10 mm. long, the 

 mner larger than the outer; corolla pink-purple, 5-7 cm. long. Bush Morning 



Glory, Big Root. Plains and prairies: S.D.— Tex.— N.M.— Mont. Plain. 

 Je-Au. 



2. I. purpurea (L.) Roth. Annual; stem high, climbing, twining, retrorsely- 

 hirsute; leaf-blades cordate, short-acuminate; flowers umbellate on long peduncles; 

 calyx bnstly-hairy; corolla purple or rarely pink or white, 4.5-7 cm. long. Com- 

 mon Morning-glory. Cultivated ground, waste places, etc.: N.S.— Fla.— Tex. 

 —Colo.; escaped from cultivation; native of trop. Am. 



4. CONVOLVULUS (Tourn.) L. Bindweed, Morning Glory. 



Annual or perennial, trailing or twining herbaceous vines, rarely shrubs. 

 Leaves alternate, usually sagittate or cordate at the base. Flowers perfect, 

 regular, solitary or clustered, on axillary peduncles. Sepals 5, rarely equal, or 

 the outer larger. Corolla funnelform or campanulate, with plaited, entire, 

 5-angled or 5-lobed hmb. Stamens 5, included; filaments filiform or dilated at 

 the base. Ovary 1-2-celled; styles united; stigmas linear to oblong; ovules 4. 

 Capsule subglobose, 2-4-valved. Seeds glabrous. 



Calyx not closely subtended by the bracts. 



^^^i^rxPS* canescent; leaf-blades hastate, but otherwise entire. 



Whole plant glabrous or nearly so. 1. C. arvensis. 



btem and lower surface of the leaves with scattered long hairs. 



Plant more or less canescent; leaves usually lobed or dissected. 



Main divisions of the leaf-blades ovate or oblong, obtuse, lobed; sepals auricled 

 at tiie oasc- 2 C hcrTtiunnioidcs* 



Main divisions of the leaf-blades linear, entire, the basal lobes' usuaUy deeply 

 cleft; sepals not auricled. 4 c incanus 



Calyx closely subtended and enclosed by the large bracts 

 Plants climbing or trailing; bracts cordate. 



Leaf-blades hastate; the basal lobes often sinuate-dentate, acute: stem and leaves 



glabrous or shghtly hairy. 5. c. amcricanus. 



i-.eat-biaaes more sagittate; basal lobes rounded, entire; stem and leaves densely 



PioT.fo^'^^^'^^^i- r. . X. . , 6. anterior. 



Plants erect or decumbent: bracts oval or oblong. 7. C. MacouniL 



J-' C. arvensis L. Stem branched at the base, prostrate or low-twining, 

 2-8 dm long, glabrous; leaf-blades oblong or ovate-sagittate to linear-hastate, 



u ^^' ^^^' obtuse or acutish; basal lobes more or less spreading, acute; bracts 

 subulate; corolla white or rose-tinged, 1.5-2 cm. long and broad. Waste places 

 and fields: N.S.— N.J.— Nev.— Wash.— B.C. Plain— SubmonL Je-Au. 



2. C. ambigens House. Stem prostrate or trailing, 2-10 dm. long, finely 

 cmereous, or glabrate in age; leaf-blades ovate-oblong or triangular-oblong, 1.5- 

 4 cm. long, abruptly acute, truncate or nearly so at the base; basal lobes spread- 

 ing, acute, often subtoothed below; flowers axillary, solitary; corolla 1.5-2 cm. 

 long and about as broad, white or with pink stripes. River valleys and loose soil: 

 Mont.— N.:M.—Cahf.— Ore. Plain— SubmonL Je-Au. 



3. C. hermannioides A. Gray. Stem branched at the base, spreading or 

 procunibent, 3-15 dm. long, silky-tomentose; leaf-blades ovate, oblong or oblong- 

 lanceolate, 1.5-7 cm. long, sinuately-toothed, cordate or sagittate at the base; 

 corolla white, 2-2.5 cm. long, 1.5-2 cm. wide, angulate. Dry plains: Tex. 

 Colo. Son, Ap-S. 



incanus 



procumbent 



X \ --^^^^^^Y^^; it^ai-uiaaes variaDie, unear-sagittate to lanceolate-hastate, wj 

 the basal lobes spreading, more or less lobed, or pedately cleft, 2.5-5 cm. lor 

 often mucronate; sepals becoming 6-8 mm. long; corolla white or pink, abo 



* ,"^™^^*^^^' ^^ ^™- broad; lobes acuminate. Dry hill? and plains: Neb. 

 Ark.— Tex.— Ariz. Son, Je-Au. 



1 hj^J ^^®ricaniis (Sims) Greene, Stem twining, 1-3 m. high, glabrate; 

 leat-biades glabrous, broadly hastate or ovate-hastate, 5-12 cm. long, acuminate 

 or apiculate; basal lobes more or less spreading, broadly triangular, with a smaller 

 lobe below; bracts broadly ovate-cordate, obtuse or acutish; corolla 4r-5 cm. long, 

 5-7 cm. broad, pink or rose-purple. Closely related to C. sepium L., of Europe. 



