220 CONVOLVULACEiE. Cuscuta. 



* (Clistogrammica, Engelm. 1. c.) Capsule indehiscent. 



•*— Calyx gamosepalous. 



++ 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, HBK. Stems 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. I. c, the only form in our flora, has all parts of the 

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

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



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

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

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

 xliii. 342, t. 6, fig. 26-29. — Wet places in the Mississippi Valley from Arkansas to Wis- 

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

 long ; the thin capsule pale greenish-yellow. 



0. 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. pentagona, 

 Engelm. 1. c, & C. pentagona, Engelm. in Am. Jour. Sci. 1. c. 340, t. 6, fig. 22-24), sometimes 

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

 fig. 25), and in a western form (var. calycina, Engelm. 1. c.) 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. tenuiflora, 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. Cephalanthi, Engelm. in Am. Jour. 

 Sci. 1. c. fig. 1-6. — On tall herbs or shrubs, such as Cephalanthus, in wet places, Penn. 

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

 distinguished from small-flowered forms of C. Gronovii 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, Eriogomm, &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 (1£ to 2 J 

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

 = Flowers short-pedicelled or clustered. 



C. salina, Engelm. Stems slender, low : flowers (1-J- to 2-J 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 



