378 CONVOLVULACF.JL. (CONVOLVULUS FAMILY.) 



§ 2. Stigmas capitate : pods indehiscent, rarely bursting irregularly. 



* Flowers more or less pedicel led : the scaly bracts few and distant: calyx 4-o-cle/t. 



■*- Corolla cylindrical, in fruit covering the top of the pod. 



2. C. tenuifldra, Engelm. Much branched, twining high, pale-colored; 

 flowers at length peduncled and in rather loose cymes ; tube of the corolla (ven- 

 tricose after flowering) twice the length of its obtuse spreading lobes and of the ovate 

 obtuse calyx-lobes ; scales ovate, cut-fringed ; stamens shorter than the lobes of 

 the corolla ; pod depressed, membranaceous, thin, yellowish. ( C. Cephalanthi, 

 Engelm.) — Swamps, New Jersey to Illinois and westward; on Cephalanthus 

 and other shrubs, and on various tall herbs. — Flower the narrowest of all our 

 Northern species. 



3. C. inflexa, Engelm. Flowers peduncled, in umbel-like cymes, 1" long; 

 tube of the mostly A-cleft fleshy corolla as long as the ocate acutish and minutely crenate 

 erect inflexed lobes and the acute keeled calyx-lobes ; scales minute and few-toothed, 

 appressed ; pod depressed, somewhat umbonate, of a thicker texture, brown, its 

 top covered with the remains of the corolla. (C. Coryli, Engelm. C. umbrosa, 

 Beyrich, and Ed. 2.) — Prairies and barrens, in rather dry soil, on Hazels, Ceano- 

 thus, and other shrubs or herbs ; from Western Virginia and Illinois southward 

 and westward. 



4. C. decdra, Chois., altered by Engelm. Flowers larger than in No. 3, 

 from l.i" to nearly 2" long, loosely paniculate, broadly campanulate; corolla 5- 

 cleft ; the lobes ovate-lanceolate, acute ; the scales large, broadly oval ; pod envel- 

 oped by the remains of the corolla. (C. ?'w decora, Chois. C. neuropetala, Engelm. 

 C. pulcherrima, Scheele.) — Wet prairies, S. W. Illinois and southward ; on va- 

 rious shrubs and herbs. — The name changed by Dr. Engelmann, because this 

 is not a homely but the handsomest of our species. 



+-r ■*- Corolla be/l-shajied, persistent at the base of die ripe pod. 



5. C. arvensis, Beyrich. Low; flowers small, 5-parted, peduncled in 

 loose umbel-like cymes; tube of the corolia included in or little exceeding the 

 broad-lobed calyx, shorter than its lanceolate acuminate spreading or reflexed 

 lobes ; stamens much shorter than the lobes of the corolla ; scales ovate, fim- 

 briate, converging and often exceeding the tube ; pod globose, thin, yellowish. 

 (C. pentagona, Engelm.) — In fields, prairies, and barrens, from S. New York 

 (C. F. Austin) to Virginia, Illinois, and southwestward ; on smaller herbs, and 

 flowering (in June and July) earlier than any other of our species. — Steins 

 low, scarcely over a foot high ; flowers smaller than in any of our species, and 

 quite variable : when with a large 5-angled calyx it is C. pentagona (Virginia) '. 

 with a small one, it is var. microcalyx (Illinois) : with a large and hemispherical 

 one, var. calycina (Texas) : with a fleshy verrucose calyx, it is C. verrucosa. 

 Engelm. (Texas.) 



6. C. chlorocarpa, Engelm. Low, orange-colored; flowers mostly 4- 

 cleft, about 1" long, short-pedicelled, in scattered clusters; corolla open bell- 

 shaped, the tube nearly the length of the acute lobes and calyx-teeth ; stamens 

 as long as the lobes ; scales small, appressed, incised, sometimes almost want- 

 ing ; the thick styles as long as the large depressed ovary ; pod depressed, thin, 

 greenish-yellow. (C. polygonbrum, Engelm.) — Low grounds, on Polygonum 



