schombuugk's gujana plants. 237 



519. D. harhata, DC, L c. ?— This agrees witli Poiret's 

 description as far as it goes. It is very near to D. setigera 

 DC, and like it has remarkably costate globose fruits, but 

 these fruits are larger, the leaves longer and narrower, and 

 the corolla much larger, being near eight lines long. — Arid 

 savannahs of the upper Rupunoony and Pirara, Schomburgk, 

 «. 161 and 707. 



520. D. artkulata, DC. Prod. iv. 564. — Shores of the 

 Essequibo, Schomburgk, n. 11. — The specimens sent in the 

 earlier sets are precisely similar to Pohi's, those in tlie latter 

 sets have the leaves broader and somewhat rough, and the 

 flowers more numerous, yet they appear to belong to the same 

 species. 



521. Borreria verticillata, Mey. — DC. Prod. iv. 541 



Moist Savannahs, British Guiana, Schomburgk, n. 618. 



522. B. alata, DC. Prod. iv. 544. — Caulis ala angustce, 

 hinc inde ciliatse. Capitula numerosa, ramulos axillares 

 breves v. caules terminantia. Fructus omnino BorrericB. 

 Caetera omnia ut in icone et descriptione Aubletii. — On the 

 Rio Negro, Schomburgk, n. 864. 



523. B. suaveolens, Mey DC. Prod. iv. ^'i^. — Dry Savan- 

 nahs, British Guiana, Schomburgk, n. 250. 



524. B. sphfsrica, DC. Prod. iv. 547 French Guiana, 



Herb. Par. n. 171. 



525. B. Perrottetii, DC. Prod. iv. 548?— Pirara, Schom- 

 burgk, n. 763. 



The genera Diodia, Borreria and Spermacoce are certainly 

 very closely allied in character, and do not appear, as at 

 present constituted, to be distinguished by any peculiarities 

 in habit. Supposing, however, their present artificial charac- 

 ters to be retained, Gardnei*'s species would be distributed as 

 follows: — 55 from Rio Janeiro, 1037 from Pernambuco, 

 2190 and 2191 from Piauhy are Diodia: of the section Eudio- 

 dittf 1037 being apparently a narrow-leaved variety of D. 

 setigera; 445 from the Organ Mountains is Diodia (Dasy- 

 cephala) alata, Nees et Mart.; 1033 from Pernambuco, 

 and 2189 from Piauhy are the Borreria ramisparsa, DC; 



