376 CONVOLVULACE^. (CONVOLVULUS FAMILY.' 



eluded. Style 1 : stigmas 2, linear or oblong. Pod imperfectly 2-cclled or 1- 

 cclled, 4-se(dod. — rerennials, with heart-shaped or arrow-shajxHl leaves, and 

 axillary l-flowcred pediincles; H. in summer. (Name from (caAu|, calijx, and 

 (TTtyw, to cover, alluding to the bracts enclosing the. calyx.) 



1. C. S^pium, 11. Br. (HiCDGE BixuwKED.) Stem tivinirig or sometimrs 

 Irailin;/ e.rieiisirelj ; leaves triangular-halberd->haijcd or 'arrow-shaped, acute or 

 pointed, the lobes at the base obliquely truncate and often somewhat toothed 

 or sinuate-Iobed ; peduncles 4-angled ; corolla white, or in the American plant 

 more commonly light rose-color ( H' - 2' long) : the typical form ylabrous through- 

 out. (Convolvulus sepium, and C. repens, L.) — Varies greatly, often slightly 

 pubescent: Var. pubescens is a downy form, in the young state approaching 

 the next. (C. Catesbyana, Parsh.) — Common, especially along the moist banks 

 of streams. (Eu.) 



2. C SpithamSea, Pursh. Downij ; stem low and mostli/ simple, upriijht or 

 ascending (G'-12' long) ; leaves oblong, with or without a heart-shaped or auri- 

 cled base ; corolla white (2' long). — Dry, mostly sandy ground : not rare. 



5. BONAMIA, Thouars. (Breweria, R. Br. & Stylisma, Raf.) 



Styles 2, or rarely 3, simple and distinct, or else united into one below : stig- 

 mas depressed-capitate. Otherwise as Convolvulus and Evolvulus. — Perennial 

 prostrate or diffusely spreading herbs (or in warmer regions sometimes shrubby) ; 

 flowers small ; in summer : corolla more or less hairy or silky outside. (Named 

 for Francis Bonamij, author of a Flora of Nantes.) 



1. B. humistrata, Gray. (Proceed. Amer. Acad. 5, p. 337.) Sparsely 

 hairfi or nearly smooth ; leaves varying from oblong with a somewhat heart- 

 shaped base to linear, mucronate ; peduncles 1 - 7-flowered ; bracts shorter than 

 the pedicels ; sepals pointed, glabrous or nearly so ; corolla icliite : ^filaments Itairi/ ; 

 styles united (it the base. (Convolvulus humistratus, Walt., who well distinguishes 

 this from the next. Stylisma evolvuloides, C/iois., in part. S. humistrata, 

 Cha/nn.) — Dry pine barrens, Virginia (probably not in Ohio), and southward. 



2. B. aqiiatica, Gray. Minntflji soft downji and somewhat hoary ; sepals 

 silk-ij ; corolla pink- or purple ; ^filaments smooth ; styles separate almost to the base : 

 otherwise nearly as in the last. (Conv. aquaticus, Walt. Stylisma aquatica, 

 Chapm.) — Mar;;in of ])onds, S. Virginia? and southward. 



3. B. Pickeringii, Gray. Soft-pubescent or smoothish ; leaves very nar- 

 rowly linear or the lowest linear-spatulate, tapering to the base, nearly sessile ; pe- 

 duncles 1 -3-flowered; bracts resembling the leaves, mostly exceeding the flowers; 

 sepals hairy : ^filaments (scarcely hairy) and styles (which are united fir above the 

 middle) exser led from the oprn white corolla. (Stylisma Pickeringii, Ed. 2.) — 

 Rather dry sandy pine-barrens, New Jersey and southward. — Stems l°-o'^ 

 long: leaves 1 '- 1 ^' long. Corolla 4"-. 'i" bruail. 



6. EVOLVULUS, L. Evolvulus. 



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

 wheel-shaped. Styles 2, each 2-cleft : stigmas obtuse. Pod 2-celled ; the cells 



