31G FLORA OF SOUTH AMKRICA AND TUE PACIFIC. 



115U. (4.) V. heUanthoides (H. & A.); herhacea? foliis 

 (ramorum) oppositis hirsutis inferioribiis oblongis snperioii- 

 bus lineari-lanceolatis dentatis, pedunculis solitariis versus 

 apicem villosis, involucri laxi foliolis exterioribiis villosis 

 spathulatis aciitis basi attenuatis internis glabriusculis acumi- 

 uatis, radio discum superante, acbeniis radii triaristatis disci 



biaristatis Dry pasture-fields in tlie interior of Entro Rios; 



Ticeedie. 



1151. (1.) OVigogyne? St/nedrelloides, (H. &A.); herba- 

 cea parce strigilloso-pubescens, foliis oppositis peliolatis ovatis 

 aculis serratis, pedunculis petiolum rarosuperantibus indicho- 

 tovnia solitariis ad ramorum apices ternis, involucro subbise- 

 riali, foliolis exterioribus majoribus elliptico-oblongis acutis, 

 radio brevi, acbeniis obconipressis radii brevissime disci lon- 

 giuscule biaristatis. — Rio Grande; Tweedie. — Tliis may pos- 

 sibly be tlie O. Megapotamica, DC. Prodr. 5. p. 629; but tbe 

 involucre is not decidedly in a single row as be cbaracter- 

 jzes tbe genus. It bas quite tbe babit o'i Synedrella nodijiora. 



1152. (I.) Ximenia microptera^ DC. p. 627 X. ence- 



loides, Don, in Hit. [non Par.) — Cerro del Diamante, Men- 

 doza; Dr Gillies. Buenos Ayres; Tweedie. — Herba annua, 

 canescens. Folia opposita et aJterna, sublonge petiolata, In- 

 tegra, subangulato-ovata, insequallter s^-rata, subtus incano- 

 strigillosa, basi in petiolum subdecurrentia. Petioli basi ex- 

 auriculati. Pedunculi 1 — 3-ni, terrainales. — This differs from 

 A', encefoides, Cav., at first sight, by the petioles not expanding 

 into foliaceous auricles at the base. The bristles at tlie apex 

 of the ovary are very small, inconspicuous, and easily 

 broken off, but we fear that character is not constant. In- 

 deed Cavanilles himself bas represented the original species 

 in the same way, although in the cultivated specimens of 

 it, in our Herbarium, we find always very decided awns. 

 Kunth describes the ray as neuter in the new species be refers 

 to this genus: Cavanilles makes it female, as does Lessing, 

 who, liowever, suspects the aclienium to be unfertile; but we 

 possess specimens having the achenia of the ray perfect. It 

 is ovoid, much warted and wrinkled, without any wing. It 



