3. Stylisma Raf. 



Six species, confined to southeastern United States. 



1. Stylisma aquatica (Walt.) Raf. 



Stems prostrate or twining, short-pubescent, to 15 dm. long; leaves short-petioled; 

 blades oblong-elliptic or oblong-lanceolate, truncate or slightly cordate at base, 

 densely short-pubescent on both surfaces, 1-3 cm. long, 3-10 mm. wide; peduncles 

 exceeding leaves; pedicels shorter than calyxes; corolla lavender, 10-15 mm. long. 

 Breweria aquatica (Walt.) Gray, B. Michauxii Fern. & Shub., Bonamia aquatica 

 (Walt.) Gray, B. Michauxii (Fern. & Schub.) K. A. Wils. 



Sandy open ground, in shallow water of ponds, depressions and lowlands, rare 

 in s.e. Tex., May-June; Tex. to Ark., Fla. and N.C. 



4. Calystegia R. Br. Hedge-bindweed 

 About 30 species, chiefly in temperate regions of both hemispheres. 



1. Calystegia sepium (L.) R. Br. 



Perennial from creeping rhizomes; stems trailing and twining, to 2 m. long; 

 leaves long-petioled; blades abruptly contracted to deeply cordate at base, acumi- 

 nate at apex; flowers axillary, solitary or paired; peduncle at first much shorter 

 (later becoming longer) than leaves, 1 -flowered; floral bracts 2, elliptic-ovate, 

 laterally overlapping, 12-25 mm. long, about twice as long as calyx and concealing 

 it; corolla funnelform, 5-angled, 4-8 cm. long, white; ovary commonly 1 -celled; 

 style simple; stigmas oblong to linear, scarcely or not flattened, obtuse; capsule 

 mostly 2- to 4-seeded. Convolvulus sepium L. 



In marshes and wet soil of stream branks and gravel beds, May-Oct.; through- 

 out temp. N. A. and Euras. 



Var. fraterniflora (Mack. & Bush) Shinners. Leaf blades deltoid-ovate to oblong- 

 ovate, glabrous to rather densely pubescent on both surfaces, mostly 4-8 cm. long. 

 2.5-5 cm. wide, the basal lobes rather widely spreading with the broad sinus open. 

 C. fraterniflora (Mack. & Bush) Brummitt, Convolvulus fraternifiorus Mack. & 

 Bush. C. sepium var. fraterniflorus Mack. & Bush. 



Rare in Okla. (Ottawa Co.) and in far n. and n.e. Tex. (known only from 

 Ochiltree, Cooke and Anderson cos.), N. M. (Dona Ana, San Juan and Rio 

 Arriba cos.) and Ariz. (Navajo and Coconino cos.), May-Oct.; cen. U. S. 



Var. repens (L.) Gray. Leaf blades narrowly deltoid-ovate to deltoid-lanceolate, 

 usually densely soft-pubescent on both surfaces (rarely glabrate), mostly 4-9 cm. 

 long. 2.5-5 cm. wide at base, rather abruptly contracted above base to an oblong- 

 lanceolate main portion 1-2 cm. wide, the basal lobes directed backward (parallel 

 with petiole) or somewhat spreading with the sinus narrow to moderately broad. 

 Convolvulus sepium var. repens (L. ) Gray. 



Rare on Gulf Coast and lower Rio Grande of Tex., July; Gulf and Atl. coasts, 

 rarely inland. 



5. Ipomoea L. Morning Glory 



Annual or perennial herbs or woody vines, shrubs or trees; stems erect to trailing, 

 creeping or twining and climbing; leaves sessile to long-petioled, simple or palmately 

 compound (in one species pinnately cut almost to midrib, appearing compound), 

 entire or toothed or shallowly to deeply lobed; flowers axillary or terminal, solitary 

 to numerous; peduncles and pedicels various; sepals 5, commonly laterally over- 

 lapping; corolla 5-angled or shallowly 5-lobed, salverform to funnelform or cam- 

 panulate, usually large, variously colored, usually open for less than 24 hours 

 (morning, daytime or night); stamens included or exserted; ovary 1- to 3-celled; 



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