d t 



104 



PLx\.NT^ WRIGHTIANJS 



Y. 



317. IvA DEALi3'ATA (sp. nov.) : herbacea, cano-tomentosa ; foliis alternis cuneato- 

 oblon<-is3-5-fidis vel laciniato-pinnatifidis vcnosis, segmentis lanceolatis subinte- 



gris 



tis ; capitiilis glabellis parvis in thyrsum terminalem angustum r 

 gestis ; involucro 5-phyllo, squamis orbiculatis mucronatis margine 

 losi-ciliato cinctis : floribus fcemineis 5 ; acheniis subglobosis. — In 



tain valley, between the Limpia and the Rio Grande, New Mexico ; Sept. ~ Root 

 annual 1 Stems nearly simple, onc or two feet high, clothed with a somewhat de- 

 ciduous implexed white wool, terete, leafy to the contracted and dense panicle. 

 Leaves two to four inches long, clothed with a fine and matted white wool, which 

 is more or less deciduous from the upper surface, very veiny, the older ones often 

 venulose-bullate, contracted into a short margined petiole, or subsessile ; some of the 

 lower, undivided and sparingly toothed ; the upper, more triangular in outline and 

 pinnately parted, the lower lobes half Tin inch to an inch long, lanceolate or linear- 

 lanceohite. Heads subsessile, crowded, not canescent, in fruit barely a line wide. 

 Invokicre uniserial. Corolla of the fertile fiowers a very short truncate tube. 

 Achenia somewhat glandular, pyriform-globose. — The foliage and inflorescence 

 bring this plant near to Euphrosyne ; but there is no inner series of hyaline involu- 

 cral scales, as in that genus and Cyclachsena, and the achenia are globular. 



318. Ambrosia coronofifolia, Torr. Sf Grav, Fl 2. p. 291. Fields at Presidio 



de San Elisario ; Sept 



Flora of North America^ pretty 



+ 



large, turgid, and entirely destitute of projecting points or tubercles.* 



FrajSseria teisuifolia, var. tripinnatifida, Gray, Pl. Lindh. 2. p. 227. 

 Ambrosia fruticosa (excl. /3.) & A. confertiflora, DC. ! l. c. A. longistylis ^? Gr«y, 

 Pl FendL p. 80. Western frontiers of Texas ; coll. of 1851. — The specimens are 



r 



young, and less than a foot high, from an apparently perennial, thickish, but hardly 

 woody root. I think the stem is not really woody in Berlandier's specimens, on 

 which De CandoIIe's Ambrosia fruticosa is founded. Lindheimer has a taller form 

 of the species in his collection of 1851, froni New Braunfels, with the stems four 

 or five feet high. The foliage varies much. The species is well distinguished by the 

 small fruit being armed all over with short and stout incurved and uncinate spines. 



319. F. TENUiFOLiA, var. lobis foliorum latioribus ssepius brevioribus. On 



the Leona and Nueces ; June. — A coarser form, of which very few specimens were 

 gathered. 



320. F. HooKERiANA, Niitt ; Torr. Sr Gray, Fl. 2. p. 294. Road-sides, valley 

 of the Rio Grande, New Mexico ; Oct. 



321. Hymenoclea monogyra, Torr. 8f Gray, Pl. Fendl p. 79^ adnot. Banks of 

 a tributary of the Pecos ; Oct. — The stems of this curious plant are three or four 



• Ambrosia psilostachya, BC. Frodr. 5. p. 526, is the same as No. 429 and 430 of Lindhelmer's Texan 

 collectlon (A. Lindheimerlana and A. glandulosa, Scheele), which, as the tubercles of the fruit were some- 

 times wanting or very obscure, I took for mere varieties of A. coronopifolia. They are perhaps suffi- 

 cienlly distinct. 



De Candolle^s specimen of A. integrifolia, from the Parls Garden, is A. bidentata. A. hispida, Pursh, 



which I have seea in the Sherardian herbarium, is a plant which has not been detected since the time of 

 Catesby, 



\ 



