220 CONVOLVULACE^E. CusctHa. 



* 'CLTSTOGKAMMICA, Engelm. 1. c.) Capsule indehiscent. 



* Calyx gamosepalous. 

 -H- Ovary and capsule depressed-globose. 



= Flowers in dense or globular clusters: corolla with short and wide tube, in age remaining at 

 base of the capsule : styles mostly shorter than the ovary. 



C. obtusiflora, HBKL. Steins orange-colored, coarse: lobes of calyx and corolla 

 rounded, as long as the tube : scales various. Nov. Gen. & Spec. iii. 122 ; Engelm. Cusc. 

 491. (Cosmop.) 



Var. glandulosa, Engelm. 1. c., the only form in our flora, has all parts of the 

 flower (1 to 1J lines long) dotted: scales large, equalling or exceeding the tube, deeply 

 fringed. Wet places, Georgia to Texas, on Polyrjonutn, &c. (W. Ind.) 



C. chlorocarpa, Engelm. Stems coarse, orange-colored : lobes of calyx and corolla 

 acute, often longer than the tube: scales small, 2-cleft, often reduced to a few teeth. 

 Gray, Man. ed. 1, 350, ed. 5, 378; & Cusc. 494. C. PoJyyonorum, Engelm. in Am. Jour. Sri. 

 xliii. 342, t. 6, rig. 26-2D. Wet places in the Mississippi Valley from Arkansas to Wis- 

 consin ; also in Penn. and Delaware, often on Polyyonum. Flowers white, 1 to 1 lines 

 long; the thin capsule pale greenish-yellow. 



C. arvensis, Beyrich. Stems pale and slender, low: flowers smaller (scarcely a line 

 long) : calyx-lobes obtuse, mostly very broad: those of corolla acuminate, longer than the 

 tube, with inflexed points: scales large, deeply fringed. Engelm. in Gray, Man. ed. 2, 

 336, ed. 5, 378, Cusc. 494, &F1. Calif, i. 535. Calyx often large and angled (var. pcntagona, 

 Engelm. 1. c., & C. fjeittat/ona, Engelm. in Am. Jour. Sci. 1. c. 340, t. G, fig. 22-24), sometimes 

 smaller and papillose or glandular-verrucose (var. rerrucosa, & C. verrucosa, Engelm. 1. c. 

 fig. 25), and in a western form (\nr.calycina, Engelm. I.e.) larger-flowered, approaching 

 the preceding species. Rather dry soil, on various low plants, New York to Florida and 

 Texas, Illinois and Missouri, California and Oregon: the varieties principally in Texas. 

 (Mex., S. Amer.) 



= = Flowers in paniculate often compound cymes : styles slender, mostly longer than the ovary. 



C. temiiflora, Engelm. Stems coarse and yellow, usually rather high-climbing : 

 flowers (a line or less long) on short thick pedicels, often 4-merous : lobes of calyx and 

 corolla oblong, obtuse ; the latter mostlj* shorter than the slender deeply campanulate 

 tube : scales shorter than the tube, fringed : marcescent corolla capping the large capsule. 

 Gray, Man. ed. 1, 350, ed. 5, 378, & Cusc. 497. C. Ce/ihahmthi, Engelm. in Am. Jour. 

 Sci. 1. c. fig. 1-6. On tall herbs or shrubs, such as Cr-phahnttlms, in wet places, Fenn. 

 (Porter) to Wisconsin, north to Saskatchewan, and south to Texas and Arizona. Readily 

 distinguished from small-flowered forms of C. Gronoi-ii by the depressed capsule covered by 

 the corolla. 



C. Californica, Choisy. Capillary stems low : flowers rather small, delicate, in loose 

 cymes : lobes of the calyx acute : those of corolla lanceolate-subulate, as long as the cam- 

 panulate tube or longer : scales none or rudimentary. Cusc. 183 ; Hook. & Arn. Bot. Beech. 

 364; Engelm. Cusc. 498, & Bot. Calif, i. 535. (Independently published, in the same year, 

 1841, by Choisy and by Hook. & Arn.) California, on arid herbs, Erior/onum, &c., in dry 

 soil. Among various forms the following are the extremes. 



Var. breviflora, Engelm. 1. c. Flowers scarcely over a line long, on shorter 

 pedicels: calyx-lobes acuminate, equalling or surpassing the tube of the corolla : filaments 

 and anthers short : style hardly longer than ovary : corolla marcescent at base of or 

 around the 2-4-seeded capsule. From the coast at Monterey, &c., to the Sierra Nevada. 



Var. longiloba, Engelm. 1. c. Flowers' longer-pedicelled and larger (14- to 2 

 lines long) : calyx-lobes often with recurved tips : corolla-lobes often twice the length of 

 the tube : filaments and anthers more slender: styles much longer than ovary : capsule 

 mostly' 1-seeded, enveloped by the corolla. Principally S. California and Arizona. 

 -H- -H- Ovary and capsule pointed; the latter enveloped or capped by the marcescent corolla. 



= Flowers sliort-pedicelled or clustered. 



C. salina, Engelm. Stems slender, low. flowers (H to 2-i lines long) delicate white; 

 calyx-lobes ovate-lanceolate, acute, as long as the similar but mostly broader and over- 

 lapping denticulate lobes and as the shallow-campanulate tube of the corolla : filaments 

 about as long as the oval anthers : fringed scales mostly shorter than the tube, sometimes 



