740 PLANT LIFE OF ALABAMA. 
SPERMACOCE L. Sp. Pl. 1:102. 1753. 
Eighty species, low herbs, tropical regions, mostly American. 
Spermacoce glabra Michx. Fl. Bor. Am.1:82. 1803. SmootH BUTTONWEED. 
Gray, Man. ed.6,225. Chap. Fl. 174. Gray, Syn. Fl. N.A. 1, pt.2:34. Coulter, 
Contr. Nat. Herb. 2: 161. 
Carolinian and Louisianian areas. Sonthern Ohio and western Tennessee to 
Florida, Texas, and Arkansas. 
ALABAMA: Lower Pine region. Coast plain. Low fields, bottom lands. Wash- 
ington, Mobile, and Baldwin counties. Flowers white; August to October. Not 
common. Annual weed. Waieaeat 
Type locality: ‘‘ Hab. ad ripas fluminis Ohio et Mississippi.” 
Herb. Geol. Surv. Herb. Mohr. 
Spermacoce parviflora (Meyer) Gray, Syn. F!.N. A.1, pt. 2:34. 1878. 
SMALL-FLOWERED BUTTONWEED. 
Borreria parviflora Meyer, Prim. Fl. Essequib. 83. 1818. 
B. micrantha Torr. & Gray, F1.N. A, 2:28, 1841. 
Chap. F1.175. Gray, Syn. FI.N. A.lc. 
West Inpirs, MEXIcO, SouTH AMERICA. 
Louisianian area. Southern Florida. 
ALABAMA: Lower Pine region. Waste places. Monroe County, Mount Pleasart 
(B.A. Smith). Annual. 
Type locality: ‘‘Hab.in St. Domingo et herbario clariss. Mertensii inest.” 
Herb. Geol. Surv. Herb. Mohr. 
RICHARDIA L. Sp. Pl. 2:330. 1753. 
(Ricnarpsonia H. B. K. Nov. Gen. & Sp. 3: 350. 1820.) 
Ten species, low annuals or perennials, mostly tropical America. 
Richardia scabra L. Sp. Pl. 1: 330. 1753. MEXICAN CLOVER. 
Richardsonia scabra St. Hilaire, Pl. Us. Bras. 8, t.8. 1824-28. 
Chap. Fl. Suppl. 624; ed.3,194. Gray, Syn. Fl. N. A.1, pt. 2:32. 
West Inpius, MExIco TO BRAZIL. 
Louisianian area. Adventive from the Tiopics and fully naturalized on the coast 
of Georgia, in Florida, and thence to Mississippi. 
ALABAMA: Lower Pine region. Coast plain. Dry sandy waste places. Flowers 
white; June to October and November. Abundant in cultivated ground. A luxu- 
riant annual; assurgent stems 2 to 3 feet long. Occasionally in the northern part of 
the State, in gardens. Cullman County, 
Economic uses: Valuable fodder plant. 
Type locality: ‘Hab. in Vera Cruce.” 
Herb. Geol. Surv. Herb. Mohr. 
DIODIA L. Sp. Pl.1:104. 1753. 
About 30 species, annual or perennial low herbs, mostly of tropical America. 
Diodia virginiana L. Sp. Pl.1:104. 1753. Common Burton FLOWER. 
Diodia tetragona Walt. F 1. Car. 87. 1788. 
El. Sk.1:190. Gray, Man. ed. 6, 225. Chap. Fl. 175. Gray, Syn. Fl. N. A.1, pt. 
2:35. Coulter, Contr. Nat. Herb. 2: 161. 
Carolinian and Louisianian areas. New Jersey through the lower country to 
Florida, west to Texas and Arkansas. 
ALABAMA: Over the State, except the highest mountain ranges. In low culti- 
vated ground, waste places, roadsides. Clay County, Delta, 1,700 feet. Cullman 
County, 800 feet. Flowers white; June to October. Abundant weed. Perennial. 
Type locality: ‘Hab. in Virginiae aquosis.” 
Herb. Geol. Surv. Herb. Molir. 
Diodia teres Walt. Fl. Car. 87. 1788. PURPLE-FLOWERED BUTTONWEED. 
Spermacoce diodina Michx. F1. Bor. Am.1:82. 1803. 
Gray, Man. ed. 6, 225. Chap. Fl. 176. Gra. , Syn. Fl. N. A.1, pt.2:35. Coulter, 
Contr: Nat. Herb. 2: 162. P ee i ; 
