94 TETRANDRIA. MONOGTNIA. 



which the R cordifolia is also common to Siberia, China> 

 Japan, and lie Cape ot" Good Hope; \n the Isle of Tene- 

 rifie there exists a shrubby species of Rubia. 



133. SPERMACOCE. L. 



Calix 4 -toothed. Corolla funnel-formed, 4- 

 cleft. Seeds 2, each bideritite. 



Flowers axillary, ver;icillate, more rarely corymbose 

 or terminally cap'tate. 



Species. 1. *S'. temdor. '2. glabra. 3. Diodina. 4. in- 

 vohicrata. 



Of this genus there are 6 species in India, and 20 in 

 Korvh and South America, chiefly within the tropics Tiie 

 S. verticidata is a shrub common to Jamaica and Africa. 



r34. DIODIA. Gronovius. L, 



Calix bifid. Corolla tubular, funnel-formed; 



Mostly procumbent; rarely scandent; stem herbaceous 

 or su frulicose, flo. ers usually ^(jliLiry and axiliary. 



Species. 1 D virginica. 2 te.ragona. 3 hirsiUa. 



An American genus, of wljicti 5 other species are indi- 

 genous to the West India islands. 



135. OLDENLANDIA. L. 



Calix 4 parted, superior. Corolla 4.cleft, (4- 

 petalled, Pers'iox.) scarcely tubulose. Capsule 

 2-celled, many-seeded. 



Mostly herbaceous, many species annual; flowers axil- 

 lary or terminal, sessile or pedunculate, peduncles 1 or 

 many.flowered; in some species the flowers are umbel- 

 late. 



Species. 1. O. glomerata. 2- wujlora. Probably a 

 mere variety of No. 1. 



This genus appears to be almost equally divided be- 

 twixt India and the tropical regions of America. The 

 genus Hedyotis to which Mr. Elliott is inclined to refer 

 the O. glomerata is also almost equally divided betwixt 

 India and South America. 



136. HOUSTONIA. L, 



Calix 4 -toothed. Corolla of 1 petal, funnel 



