PBNTRANDRIA. DIGYNIA. 173 



rope, and East Asia, 'Siberia, &c.) here ihey continue to 

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

 Siberian species uill no doubt be discoveitd in Lo.vei" 

 Canada and Labrador. 2 species were discoveicd by Fors- 

 ter in New Zealand, and a species of doubtful g-enus is 

 said to exist in the Azores. — All the sp^^ciesof tins j^enus 

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

 is most esteemed in medicine. 



£49. HYDROLEA. L, 



Calix 5-parte(l. Corolla rotate, or cam[)anu- 

 late. Filaments o{ i\\G uniUevSf covi\dte at the 

 base; anthers cordate. Style long and diver- 

 gent; Stigmata capitate-peitate. Capsule 2- 

 ceUed, 2-valved. 



Herbaceous; flowers bracteate; terminal or axillary, 

 solitary, corymbose or paniculate; some of the species 

 produce axillary spines. 



Species. 1.' //. caroliuiana. Capsule not 4-valved. 



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

 tropical or warmer regions of America, with the excep- 

 tion of ZT. Zei/Zamca of India. 



Obs. In H. spinosa, so nearly allied to //. carolmifma^ 

 according to Jussieu the flowers are sometimes 6-cleftj 

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



250. DICHONDRA. Forster, 



Calix 5 -parted; segments spat iiu late. Corolla 

 shortly campanidate, 5-parted. Stigma peltate- 

 capitate. Capsule subcompressed, didyinous, 

 "l-celled, cells 1 -seeded. Seed globose. 



Small perennial creeping plants; nearly allied to Evol- 

 vnbis. Leaves reniform, alternate; peduiicles 1-flowered; 

 flower small and cernuous- 



Species. 1 IJ. cm^) linen sis. Leaves reniform and 

 ^marginatc; under side covered with a thin silky villous; 

 upper side also ptibescent, but greener than the imderj 

 caux villous externally. Obs. Peduncle 2 or 3 inches 

 long, and 1 or 2 from the same axil!; calix reticulately 

 veined. Leaves sometimes suborbicular and entire.— 

 Probably J), rcpem-. 



This genus, apparently consisting of but a single spe- 

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

 and continuing to Perti extends as far as New Zealand in 

 the southern hemisphere. (Ord-Nat. Cokvox-vuj-acf-iO 

 q, 2 



