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1. R. scabra L. Loosely branching and spreading: leaves ovate to lanceolate. 
oblong, 2,5 to5cm. long, roughish: stipules with rather few setiform appendages : 
glomerules of flowers and fruit depressed: corolla 4 to 6 mm. long.—Low or sandy 
ground, extensively naturalized in the low country of all the Gulf States. Often 
called “ Mexican clover,” and relished by cattle. 
7. CRUSEA Cham, 
Perennials or annuals with the habit of Diodia, 3 to 5-merous flowers, 
calyx-lobes subulate to triangular-lanceolate (sometimes very unequal), 
salverform to narrow funnelform corolla, 2 to 4 linear to Spatulate-oval 
stigmas, and a 2 to 4-lobed fruit separating from a persistent axis into 
obovoid or globular chartaceous earpels, which either open at the com- 
missure or sometimes remain closed. 
1. C, allococea Gray. 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 oblong-lanceolate, 12 to 24 mm, 
long: corolla funnelform, 3 or 4-lobed: calyx-lobes 3 to 5, lanceolate, longer than 
the ovary and fruit: fruit obovate-globose, more or less hispidulous or glabrous. 
(Diodia tricocca T. & G, D. tetracocea Hemsl.)—Prairies of Texas. 
8. SPERMACOCE Dill. (Burron-weErp.) 
Small herbs or suffrutescent, with bases of the leaves or petioles con- 
nected by a bristle-bearing stipular membrane, small whitish flowers 
crowded into sessile axillary whorled clusters or heads, short calyx-tube 
with limb parted into 4 teeth, funnelform or salverform corolla, 4 sta- 
mens, 2-cleft style or stigma, and a small dry 2-celled 2-seeded fruit 
splitting when ripe into 2 carpels. 
1, 8. glabra Michx. Spreading or decumbent, smooth and glabrous: leaves oblong- 
lanceolate and oblong, 2.5 to 5 cm. long, not prominently veined: corolla more cam- 
panulate than funnelform, very villous in the throat, little surpassing the large 
calyx-teeth: fruit somewhat turbinate, crowned by the 4 conspicuous at length tri- 
angular-lanceolate spreading calyx-teeth: but one of the carpels ventrally dehiscent, 
—River banks and low ground throughout the Atlantic States, and extending into 
Texas to Brazos Santiago. 
2, S. podocephala Gray. Suffrutescent tufted perennial, glabrous or sometimes 
obscurely puberulent: stipular bristles few; leaves numerous, about the length of 
the internodes and axillary-fascicled, narrowly linear (2.5 cm. or less long), sel- 
dom over 2 mm. wide, veinless, not rarely with revolute margins, 2 to 6 uppermost 
raised on a Jong peduncle-like internode and involucrating the solitary globose glom- 
erule: corolla short funnelform: fruit obovate and didymous, each carpel surmounted 
by a subulate or obtuse calyx-tooth (the intermediate teeth rudimentary or want- 
ing), and both ventrally dehiscent. (Borreria podocephala DC.)—Southern Texas, 
9. DIODIA Gronov.  (Burron-wrrp.) 
Resembling Spermacoce, but flowers 1 to 3 in each axil, calyx-teeth 
2 to 5 (often unequal), and fruit 2- (rarely 3-) celled, the crustaceous car- 
pels into which it splits all closed and indehiscent. 
1. D. Virginiana L. Smooth or hairy perennial: stems spreading, 5to 6 dm. long: 
leaves lanceolate or oblong-lanceolate, sessile: corolla white, 12 mm. long, the slen- 
der tube abruptly expanded into the large limb: style 2-parted: fruit oblong, 
