460 PROCEEDINGS OF THE ACADEMY OF 



destitute of leaves near the flowers ; leaves about half a Hue wide, elongated, 

 and 3 6-parted, with opposite or alternate segments ; whole plant sparingly 

 pubescent; flowers 3 4 lines in diameter; the lower pappus of many white 

 hairs is at the base of, and about equal in length to the achenia ; palea nearly 

 as long as the achenia which they crown. The flowers have a resemblance 

 to those of Riddellia. Name from the Greek, signifying its love of arid places. 



Heleneum (Tetrodus) T e x a n u m, s. nov. Annua, glabra ; caulibus erec- 

 tis, 3 4 pedali, ramosissimis ; ramis superioribus, alatis ; foliis caulinis lan- 

 ceolatis, integris, vel remote denticulatis, decurrentibus, capitulis parvis obo- 

 vato-globosis, ligulis cuneatis trilobis parvis, disco, multum brevioribus, pap- 

 pus paleaceus ; paleis ovatis aristatis ; involucri squamis linearis, acuminatis. 



North of Fort Mason. June. 



Radical leaves wanting in our specimens. Heads brownish yellow, 4 lines 

 in diameter ; rays yellow, scarcely 4 lines in length, 3-cleft, teeth acute ; in- 

 volucri longer than the rays ; flowers many, and terminated in branches which 

 are leafy to the summit ; achenia villous. 



Cirsium Texanum, s. nov. Caule erecto, ramoso, 3 4 pedalis ; foliis 

 ovatis, integris ; superiores amplexicaulis ; radicalibus sessilibus vel breviter 

 petiolatis ; subtus dense canescenti-tomentosis, superne glabris, margine re- 

 pando-dentatis, spinosis ; involucri subglobosi squamis imbricatis, intimis 

 lineari-lanceolatis, subulatis ; exterioribus ovatis, lanceolatisque cuspidatis ; 

 flosculis purpureis. 



Near Brady's Creek, north of Fort Mason. June. 



Stems divaricately branched ; flowers axillary or terminal ; leaves none, or 

 few, in the elongated flowering branches ; stems tomentose, upper leaves 1 2 

 inches long ; radical leaves 3 4 inches. 



CaMPANULACEjE. 



Specularia (Campanula) Linsecomia, s. n. Glabra ; caule decum- 

 bente, parce ramoso ; foliis sessilibus, lanceolatis apice attenuatis, acutis, 

 bracteis longe linearibus ; floribus axillaribus 2 5-glomeratis ; calycis tubus 

 elongata 3 5-lobis ; segmentis linearis, acutis. 



On Brady's Creek, north of Fort Mason. June. 



Leaves alternate, 4 6 lines distant, in every axil of which flowers and 

 bracts abound ; capsules 6 8 lines long, 3-valved dehiscent on the sides ; 

 seeds smooth, elliptical. Whole plant smooth, excepting the margins of some 

 of the leaves, which are minutely ciliate with white hairs, scarcely percepti- 

 ble without the aid of a glass. Our specimens are in fruit only. 



Campanula Coloradoense, s. nov. Glabriusculis ; caule erecto, sim- 

 plo, multifloro ; foliis caulinis sessilibus, lanceolatis, margine integris aut 

 interrupte dentatis, minute ciliatis ; radicalibus petiolatis, subobtusis ; flori- 

 bus axillaribus vel terminalibus; simplici seu duplici ; bracteis linearibus, 

 acutis ; tubo calycis elongato linearis acutis ; corolla profunde 5-fida sub- 

 sequantibus ; capsula cylindracea, 3-valvis, lateraliter sitis dehiscens ; semina 

 ellipsoidea. 



On the Upper Colorado of Texas. June. 



Plant 1 2 feet high ; leaves few and alternate ; lower stem and leaves have 

 a few white, erect hairs ; style exserted ; stigmas 4 5 ; leaves 1 H inches 

 long and about 4 lines wide. 



Ericacea. 



Arbutus T exa n a, s. nov. Arborea 20 25 pedali, glaberrima ; foliis ova- 

 tis, subacutis, parce serratis ; .floribus capitatis, subracemosis calycibus albis, 



[Dec. 



