392 CONVOLVULACEAE (MORNING-GLORY FAMILY) 



97. CONVOLVULACEAE Vent. MORNING-GLORY FAMILY 



Herbs, chiefly trailing or twining vines, with alternate, exstipulate leaves 

 and regular 5-androus flowers. Calyx-lobes or sepals imbricated. Corolla 

 sympetalous, the limb angled or plaited, 5-lobed or nearly entire, convolute 

 in bud. Stamens inserted on corolla-tube. Ovary 2-3-celled with 2 ovules 

 in each cell, the cells sometimes doubled by a false partition, entire, with ter- 

 minal style, or 2-3-divided with 1-3 styles from between the lobes. Fruit a 

 capsule. 



Styles 2 and 2-cleft 1. Evolvulus. 



Style 1. 



Stigmas 1-3, small, capitate . 2. Ipomoea. 



Stigmas 2, linear to oblong .3. Convolvulus. 



1. EVOLVULUS L. 



Hairy or silky-pubescent herbs, with erect or diffuse or prostrate (never 

 twining) stems, small leaves, and small axillary flowers. Calyx of nearly equal 

 segments. Corolla small, purple or blue, rotate, campanulate, or funnelform, 

 solitary or on few-flowered peduncles. Styles 2, distinct or sometimes united 

 below, each 2-cleft; stigmas linear-filiform or somewhat clavate. Capsule 

 2-4-valved, 1-4-seeded. 



1. Evolvulus pilosus Nutt. Gen. 1: 174. 1818. Whole plant densely 

 silky-villous, silvery or becoming fulvous; stems numerous from a lignescent- 

 base, erect or ascending, 1-2 dm. high, very leafy: leaves spatulate and ob- 

 tuse to linear-lanceolate and acute, 7-15 mm. long: flowers solitary on short, 

 2-bracted peduncles: sepals acute: corolla short, funnelform-campanulate. 

 E. argenteus Pursh. 



2. IPOMOEA L. MORNING-GLORY 



Twining, trailing, or erect annual or perennial herbs, mostly with large 

 showy flowers. Sepals usually unequal. Corolla funnelform to trumpet- 

 shaped, plicate and generally convolute; the limb from entire to lobed. Sta- 

 mens included. Style slender, with capitate stigma. Capsule globular, 2-4- 

 celled, 4-6-ovuled. 



Perennials; ovary 2-celled. 



Trailing; leaves cordate 1. I. pandurata. 



Erect; leaves linear . . . . . . . . .2. I. leptophylla. 



Annuals; ovary 3-celled. 



Leaves entire, cordate . . . . . . . . .3. I. purpurea. 



Leaves more or less lobed. 



Corolla violet-purple, 2-3 cm. long 4. I. mexicana. 



Corolla light blue, 4-5 cm. long 5. I. hederacea. 



1. Ipomoea pandurata (L.) Meyer, Prin, Fl. Esseq. 100. 1818. Nearly 

 glabrous; stems trailing or scrambling, 1 m. or more long; root very long and 

 large: leaves mostly entire, cordate or some of them angulate or lobed, 4-8 cm. 

 long: sepals oblong: corolla funnelform, with broad limb, 5-7 cm. long, white 

 with purple throat: seeds woolly on the angles. WILD POTATO VINE. 

 Scarcely within our range; southeastward. 



2. Ipomoea leptophylla Torr. Frem. Rep. 95. 1845; Emory Rep. 148. pi. 

 11. 1848. Wholly glabrous; stems erect or diffuse, 6-12 dm. high, several 

 from an enormous root: leaves linear, 5-10 cm. long, 4-6 mm. broad, short- 

 petioled, acute: sepals ovate, obtuse, the outer ones shorter: corolla funnelform, 

 pink to purple, 6-8 cm. long, the limb nearly entire: capsule ovoid, acute; 



