266 CONVOLVULACE^. (CONVOLVULUS FAMILY.) 



to 3-toothed ; some pedate, having narrowly 2 to 3-cleft lateral lobes or divis- 

 ions ; some more coarsely 3 to 5-parted, with lobes entire or coarsely sinuate- 

 dentate : peduncles 1 to 2-flowered, as long as the leaf: corolla white or tinged 

 with rose, | inch long, the angles salient-acuminate. — Includes C. lohatus, 

 Eng. & Gray. S. Colorado and Arkansas to Texas and Arizona. 



3. EVOLVULUS, L. 



Low and small rather suffrutescent plants, with erect or diffuse or prostrate 

 (never twining) stems, entire leaves, one to few-flowered peduncles, aiid small 

 purple or blue almost rotate corolla. Our species has both sides of the leaves, 

 stems, and calyx densely silky-villous. 



1. E. argenteus, Pursh. Stems numerous from a lignescent base, rather 

 stout and rigid, erect or ascending, a span or so high, very leafy : dense pube^s- 

 tence sometin)es silvery-canescent, usually fulvous or ferruginous : leaves from 

 ^patulate and obtuse to linear-lanceolate and acute: pedicels very short. — 

 Plains and prairies, from Kebraska to Wyoming, Colorado, and southward. 



4. CU SCUTA, Tourn. Dodder. 



Flowers 5- (rarely 4-) merous : calyx cleft or parted : corolla globular-urn 

 shaped, bell-shaped, or somewhat tubular : stamens inserted in the throat of 

 the corolla above as many scale-like lacerate appendages: ovary globular, 

 2-celled, 4-ovuled : styles (in ours) distinct and terminated by peltate-capitate 

 stigmas : embryo thread-shaped, spirally coiled, destitute of cotyledons — 

 Leafless thread-like stems yellowish or reddish in color, bearing a few minute 

 scales instead of leaves: flowers small, cymose-clustered, mostly white. 



* Capsule indehiscent. 

 •h- Calijx gamosepaJous. 

 '*•*■ Ovary and capsule depressed-globose: flowers in dense or globular clusters: 

 corolla with a short and wide tube, in age remaining at the base of the capsule: 

 stijles mostlif shorter than the ovary. 



1. C. arvensis, Beyrich. Stems pale and slender, low : flowers scarcely 

 a line long: calyx-lobes obtuse, mostly very broad: those of the corolla acu- 

 minate, longer than the tube, with inflexed points : scales large, deeply fringed. 

 — In rather dry soil, on various low plants, across the continent. The var. 

 pentagona, found in Colorado, has a large and angled calyx. 



++ *+ Oi-ari/ and capsule pointed ; the latter enveloped or capped by the marces- 



cent corolla : flowers m paniculate cymes. 



= Acute tips of corolla-lobes inflexed or corniculate. 



2. C. decora, Choisy. Stems coarse: flowers fleshy and more or less 

 papillose : lobes of the calyx trianirular, acute : those of the broadly cam- 

 panulate corolla ovate-lanceolate, minutely crenulate, spreading: scales large, 

 deepli/ fringed : capsule enveloped by the remains of the corolla. 



Var. puleherrima, Engelm. A larger form, with coarse stems, and 

 conspicuous flowers 1^ to 2| lilies long and ivide: anthers and stigmas yellow oi 

 deep purple. — On herbs and low shrubs in wet prairies, principally Legumi 



