370 CONVOLVULACEJE. (CONVOLVULUS FAMILY.) 



Var. ripens, Gray. More or less pubescent; sterile and sometimes 

 flowering stems extensively prostrate ; leaves more narrowly sagittate or cor- 

 date, the basal lobes commonly obtuse or rounded and entire ; corolla from 

 almost white to rose-color ; bracts very obtuse or acute. (Calystegia sepium, 

 var. pubescens, Gray.) Common. 



2. Stigmas filiform ; no bracts at or near the base of the calyx. 



C. ARVENSIS, L. (BINDWEED.) Perennial ; stem procumbent or twining, 

 and low ; leaves ovate-oblong, arrow-shaped, with the lobes at the base acute ; 

 peduncles mostly 1 -flowered ; bracts minute, remote ; corolla (9" long) white 

 or tinged with reddish. Old fields, N. Atlantic States. (Eu.) 



4. BREWERIA, R. Br. 



Styles 2, or rarely 3, simple and distinct, or else united into one below ; 

 stigmas depressed-capitate. Otherwise as Convolvulus and Evolvulus. 

 Perennial prostrate or diffusely spreading herbs ; flowers small ; in summer ; 

 corolla more or less hairy or silky outside. (Named for Samuel Brewer, an 

 English botanist or amateur of the 18th century.) 



1. B. humistrata, Gray. Sparsely hairy or nearly smooth; leaves 

 varying from oblong with a somewhat heart-shaped base to linear, mucronate 

 or emarginate ; peduncles 1 - 7-flowered ; bracts shorter than the pedicels ; 

 sepals pointed, glabrous or nearly so; corolla white; Jilaments hairy ; styles 

 united at base. (Bonamia humistrata, Gray.) Dry pine barrens, Va. to La. 



2. B. aquatica, Gray. Minutely soft downy and somewhat hoary ; pe- 

 duncles 1-3-flowered; sepals silky ; corolla pink or purple; Jilaments smooth; 

 styles almost distinct; otherwise nearly as n. 1. (Bonamia aquatica, Gray.) 

 Wet pine barrens and margins of ponds, N. C. to Tex., extending into Mo. 



3. B. Pickering!!, Gray. Soft-pubescent or smoothish; leaves very 

 narrowly linear or the lowest linear-spatulate, tapering to the base, nearly 

 sessile ; peduncles 1 - 3-flowered ; bracts resembling the leaves, mostly exceeding 

 the flowers; sepals hairy ; Jilaments (scarcely hairy) and styles (united far 

 above the middle) exserted from the open white corolla. (Bonamia Pickeringii, 

 Gray.) Dry pine barrens and prairies, N. J. and southward ; also W. 111. 



5. EVOLVULUS, L. 



Calyx of 5 sepals, naked at base. Corolla open funnel-form or almost ro- 

 tate. Styles 2, each 2-cleft ; stigmas obtuse. Capsule 2-celled ; the cells 

 2-seeded. Low and small herbs or suffrutesceut plants, mostly diffuse, never 

 twining (hence the name, from evolvo, to unroll, in contrast with Convolvulus). 



1. E. argenteus, Pursh. Many-stemmed from a somewhat woody base, 

 dwarf, silky-villous all over ; leaves crowded, broadly lanceolate, sessile, or the 

 lower obloug-spatulate and short-petioled, about % long ; flowers almost ses- 

 sile in the axils ; corolla purple, 3" broad. Sterile plains and prairies, the 

 Dakotas and Neb. to Mo. and Tex. 



6. C US CUT A, Tourn. DODDER. 



Calyx 5- (rarely 4-) cleft, or of 5 sepals. Corolla globular-urn-shaped, bell- 

 shaped, or short-tubular, the spreading border 5- (rarely 4-) cleft, imbricate. 

 Stamens with a scale-like often fringed appendage at base. Ovary 2-celled. 



