CONVOLVULACEAE. 283 



Style 1. 



Stigmas capitate. 1. Ipom(EA. 



Stigmas filiform or oblong. 2. Convolvulus. 



Styles 2. 3. Cressa. 



1. IPOMOEA L. Morning-glory. 



Twining, trailing, ascending or rarely erect herbs with 

 large showy axillary solitary or cymose flowers. Sepals 

 equal or unequal. Corolla funnelform or campanulate, 

 the limb entire, 5-angled or 5-lobed. Stamens equal or 

 unequal, included; filaments filiform or dilated at the 

 base; anthers globose or ovoid; ovary 2-4-celled, 4-6- 

 ovuled; style fiUform, included; stigmas 1-2, capitate or 

 globose. Capsule septifragally 2-4-valved, 2-4-seeded. 



1. I. purpurea (L.) Roth. Annual, pubescent; stem retrosely 

 hairy, twining or trailing; leaves broadly ovate, deeply cordate, 

 acute or acuminate, 5-10 cm. broad; peduncles slender, 1-5-flowered; 

 sepals lanceolate or oblong, acute, pubescent or hirsute toward the 

 base; corolla 5-7 cm. long, blue or purple varying to white; ovary 

 3-celled, rarely 2-celled; capsule depressed-globose, shorter than the 

 sepals. 



An escape from gardens. Introduced from tropical America. 



2. CONVOLVULUS L. 



Herbs, mostly perennials with slender rootstocks and 

 trailing twining or erect stems. Flowers axillary, soli- 

 tary or clustered, large and showy. Sepals nearly equal 

 or the outer larger, the calyx bractless or with a pair of 

 bracts at or near its base. Corolla and stamens as in 

 Ipomoea. Ovary 1-2-celled; style filiform; stigmas 2, 

 filiform, oblong or ovoid. Capsule globose or nearly so, 

 1-4-celled, 2-4-valved. 



Bracts remote from the calyx, small, subulate. 1. C. arvensis. 

 Bracts usually embracing the calyx, broad. 



Leaves reniform, thick and succulent. 2. C. soldanella. 



Leaves cordate to sagittate, not succulent. 3. C. occidentalis. 



1. C. arvensis L. Perennial, prostrate; the stems 3-10 dm. 

 long; leaves oblong, sagittate or hastate, 2.5-5 cm. long, the basal 

 lobes short; pedicels 1-3-flowered, w^ith a pair of subulate bracts 

 near the base; corolla white with a tinge of purple on the outside, 

 neither lobed nor angled; stigma filiform. 



Occasional in cultivated fields and waste places. May-Novem- 

 ber. 



2. C. soldanella L. Low, glabrous, slightly succulent; stems 

 15-30 cm. long, prostrate; leaves reniform, deep green and shining, 



