94 TETRANDRIA. MONOGYNIA. 



which the R. cordifolia is also common to Siberia, China* 

 Japan, and the (Jape of Good Hope; in the Isle of Tene- 

 riffe there exists a shrubby species of Rubia. 



133. SPERxMACOCE. L, 



Calix 4-t()otlied. Corolla funnel- formed, 4* 

 cleft. Seeds 2, each bideiitate. 



Flowers axillary, ver icillate, more rarely corymbose 

 or terminally capitate. 



Species. 1. 6'. tenuior. 2. glabra. 3. Diodina. 4. in- 

 volucrata. ' 



Of this g-enus there are 6 species in India, and 20 in 

 Nor.h and South America, cliirfiy witnin tiie tropics The 

 S. verticillata is a shrub common to Jamaica and Africa- 



134. DIODIA. Gronovius. L. 



Calix bifid. Corolla tubular, funnel-formed, 

 4.cleft. Capsule 2-celled, cells 1 -seeded. 



Mostly procumbent; rarely scandent; stem herbaceous 

 or su iruticose, flowers usually solitary and axillary. 



Species. 1 D.virginica. 2. tetragona. Shirsuta. 



An American genus, of which 5 other species are indi« 

 genous to the West India islands. 



135. OLDENLANDIA. L. 



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

 petalled, Pers )0N.) scarcely tubulose. Capsule 

 2-celled, many-seeded. 



Mostly herbaceous, many species annual; flowers axU- 

 lary or terminal, sessile or pedunculate, peduncles 1 or 

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

 late. 



Species. 1. O. glomerata. 2. xmfiora. 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 He'yotia to which Mr. Elhott 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 



