OF ARTS AND SCIENCES. 321 



The remaining Monopetalse will be annotated, when needful, in the 

 following article. 



2. Characters of New or Obscure Species of Plants of 

 Monopetalous Orders in the Collection of the United 

 States South Pacific Exploring Expedition under Captain 

 Charles Wilkes, U. S. N. With occasional Remarks, 8fc. 

 By Asa Gray. 



Characters of the new or more interesting Compositce, Loheliacece, 

 and Sc(BvolecB of this collection were communicated to the Academy a 

 year ago, and printed in the Proceedings, Vol. V. p. 115, et seq. The 

 Ruhiacece and Loganiacece were similarly discussed at earlier periods 

 (Proceedings, Vol. IV., April, 1858, and September, 1859). 



CalycerecE. 



Boopis CRASSIFOLIA (Acicarpa crassifolia, Miers in Ann. & Mag. 

 Nat. Hist. 1860, p. 402) : glaberrima ; caule (spithamaso ad pedalem) 

 ramoso adscendente ; ramis ad apicem usque foliosis ; foliis carnosis, 

 caulinis sessilibus plerumque subamplexicaulibus lanceolatis seu lingu- 

 latis repando-denticulatis ; capitulis breviter pedunculatis ; involucro 

 subcarnoso alte 5 - 7-fido, segmentis oblongis ; filamentis vix basi 

 monadelphis ; acheniis fere pentapteris ; calycis lobis maturis scarioso- 

 cartilagineis dorso eximie carinatis intus concavis margine tenui eroso- 

 denticulatis pi. m. difformibus, nunc late triangulari-ovatis acutis 

 brevibus, nunc ovato-lanceolatis vel subulatis achenium dimidium 

 adaaquantibus ; paleis receptaculi filiformibus apice spathulatis. — Rio 

 Negro, North Patagonia, on the sandy shore. — I do not remember 

 the state of Tweedie's specimen (from Maldonado) in the Hookerian 

 herbarium, with which ours was long since compared. But probably 

 it is not in fruit ; else Mr. Miers would not have referred to Acicarpha 

 a plant in which the calyx-lobes are cei'tainly paleaceous and (although 

 the narrower ones are rigid) not spinescent, and the achenia not at all 

 concreted. He would more probably have found a place for it in his 

 genus Anomocarpiis, formed of some species of Galycera. Although I 

 refer it to Boopis, notwithstanding some difformity in the calyx-lobes 

 of different flowers, and the appi'oach to a subulate character in the 

 narrower ones, I am inclined to think that even Boopis is likely to 

 be reduced to a mere section of the original genus Galycera. 



VOL. V. 41 



