PENTRANDRIA. DIGYNIA. 173 



rope, and East Asia, (Siberia, &c.) here they continue to 

 occur to the very limits of perpetual snow; several of the 

 Siberian species will no doubt be discovered in Lower 

 Canada and Labrador. 2 species were discovered by Fors- 

 ter in New Zealand, and a species of doubtful genus is 

 said to exist in the Azores.— All the species of this genus 

 are bitter and tonic; but the root of G. lutea is that which 

 is most esteemed in medicine. 



249. HYDROLEA. L. 



Calix 5-parted. Corolla rotate, or cam[)ami- 

 late. Filaments oi the SLnthevSf cori]d.tG at the 

 base; anthers cordate. Style long and diver- 

 gent; Stigmata capitate-peltate. Capsule 2- 

 celled, 2-valYed. 



Herbaceous; flowers bracteate; terminal or axillary, 

 solitary, corymbose or paniculate; some of the species 

 produce axillary spines. 



Species, l'. U. carolinicma. Capsule not 4-valved. 



A genus of six species, (sec. Persoon) indigenous to the 

 tropical or warmer regions of America, vvitli the excep- 

 tion of H. Zeylanica of India. 



Obs. In H. spinosa, so nearly allied to H. caroUniana, 

 according to Jussieu the flowei's are sometimes 6-cleft, 

 with 6 stamens, 3 styles, and a capsule of 3 cells. 



250. DICHONDRA. Forster. 



Calix 5-parted; segments spathulate. Corolla 

 shortly campanulate, 5-parted. Stigma peltate- 

 capitate. Capsule subcumpressed, didymous, 

 2-celled, cells 1 -seeded. Seed globose. 



Small perennial creeping plants; nearly allied to Evol- 

 vulns. Leaves reniform, alternate; peduncles 1-flowered; 

 flower small and cernuous- 



Species. 1. I). caroHnensis. Leaves reniform and 

 emarginate; under side covered with a tiiiu silky villous; 

 upper side also })ubescent, but greener ihan tlfe under; 

 calix villous externally. Obs. Peduncle 2 or 3 inches 

 long, and 1 or 2 from the same axiii; calix reticulalely 

 veined. Leaves sometimes suborbicular and entire.-^ 

 Probably J), repeiis. 



This genus, apparently consisting of but a single spe- 

 cies, exists from South Carolina to the West India Islands, 

 and continuing to Peru extends as far as New Zealand \\\ 

 the southern hemisphere. (Ord-Nat. Coi* volvu lacei.j 

 ^ 2 



