Spermacoce. RUBIACEJE. 33 



of Diodia, the rose-colored or white corollas elongated in the typical species : sta- 

 mens and style usually exserted. — Linnasa, v. IGo; DC. Prodr. iv. 56G ; Hook. 

 & Arn. Bot. Beech, t. 99 ; Benth. & Hook. Gen. ii. 144 (calyx wrongly said to 

 persist on the fruit); Gray, Proc. Am. Acad. xix. 77, — where the genus is 

 extended. 



* Corolla rose-piirple, with slender almost filiform tube: erect anmiaU 



C. ^Trightii, Gray. Sparsely hirsute, about a foot high, with loug interuodes : leaves 

 obloug-lanceolate, ncrvose-veiuy, upper atteuuate-acute ; uppermost four or more iuvolucrate 

 around the solitary capitate glomerule : calyx-lobes 4, attenuate-subulate and almost equal, 

 nearly equalling the corolla-tube, or two of them sometimes very short, liis])id-ciliate toward 

 the base : corolla salverform, 2 lines long : stigmas 2, short-linear: ovary and immature fruit 

 didymous. — PI. Wright, ii. 68. — Plains and mountains of S. Arizona, Wright, Leinmon, 

 Habit of C. rubra, but far smaller-flowered. 



* * Corolla white or whitish, small (about 2 lines long): stamens and style little exserted: stig- 

 mas short: low and diffuse annuals or perennials. 



C. subulata, Gray. Glabrous and smooth throughout: stems ascending from an annual 

 root, a span or two high, somewhat paniculately branched : branches flowering from most 

 of the axils ; leaves narrowly linear becoming subulate (inch or less long): clusters rather 

 few-flowered : corolla almost salverform : calyx-lobes 2 or 3 lanceolate and foliaceous, one or 

 two much smaller and partly scarious or reduced to stipule-like teeth : gyncccium 2-merous : 

 fruit cuneate-oliovate, slightly didymous, obscurely pi^berulent : carpels coriaceous, at ma- 

 turity separating from a narrow linear and bifid persistent carpophore (not unlike that of 

 some Umbelliferffi) and opening on the ventral face — Proc. Am. Acad. xix. 78, not that 

 of Hemsl. Biol. Centr.-Am., which is a slip of pen or tj'pe for C. suhalata, Hook. & Arn. 

 Spermacoce suhnlata, Pav. ex DC. (Borreria stibulata, DC. Prodr. iv. 543) ; Hemsl. 1. c. 60. — 

 S. Arizona, Wright (from seeds which w-ere raised in Botanic Gardenj Cambridge, in 1852), 

 Leinmon. (Mex,) 



C. allococca, Gray', 1. c. Hirsute or hispidulous to almost glabrous, diffusely branched 

 from a perennial root, low and much spreading or depressed, flowering from summit and 

 uppermost axils : leaves from linear to obloug-lanceolate (half-inch to barely inch long) : 

 corolla funnelforra, 3-4-lobed : calyx-lobes 3 to 5, commonly 4 and equal, lanceolate, longer 

 than the ovary and fruit : gyno^cium 3-4-merous : stigmas short and broad : fruit obovate- 

 globose, sometimes glabrous aud smooth, sometimes partially or wholly hispidulous, 3-4- 

 coccous, more commonly 3-coccous ; the carpels flattened on the ventral face, separating from 

 a weak scarious carpophore, either closed or torn open ventrally. — Diodia tricocca, Torr. &. 

 Gray, El. ii. 30. D. tetracocca, Hemsl. Biol. Centr.-Am. Bot. ii. 56, t. 40, f. 10-15. Sperma- 

 coce? tetracocca, Martens & Gal. Bull. Acad. Brux. xi. 132, fide Hemsl. — Prairies of Texas, 

 first coll. by Berlandier, Drummond, &c. (Mex.) 



24. SPERMACOCE, Dill. (Sttcp/xq, seed, aKi^iKi], point; the carpels 

 pointed or crowned with one or more calyx-teeth.) — Low herbs, with small and 

 white sometimes bluish or purplish flowers, and small fruits in sessile glomerules 

 at the nodes ; chiefly tropical, the greater number American. — Dill. Elth. ii. 

 370, t. 227 ; L. Gen. ed. 1, 25 ; Benth. & Hook. Gen. ii. 145. Spermacoce 

 & Borreria, Meyer, Prim. Fl. Esseq. 79; Cham. & Sclilecht. in Linn, iii. 310, 

 355 ; DC. Prodr. iv. 540, 552. Fl. summer : corolla in our species short and 

 white. 



S. involucuAta, Pursh, Fl. i. 105, appears to have been founded on Crusea rubra, Cham. 

 & Schlccht. (notwithstanding the "flowers white"), and without much doubt was wrongly 

 attributed to this country. 



* Leaves from oval to oblong-lanceolate, contracted into a narrow base or short and niargintd 

 petiole, obliquely more or less piimate-veined, in ours smooth and glabrous or a little scabrous: 

 fruit splitting into the two carpels, one broadly open on the ventral face and discharging its 

 seed, tlie other closed (at least at first) bj' the membranaceous or coriaceous dissepiment.' — 

 Spei-macoce, G. F. W. Meyer, 1. c. ; DC. 



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