NATURAL SCIENCES OF PHILADELPHIA. 449 



Lepidium Texanum, s. nov. Annuum, glabrum vel parce pulverulentum, 

 caulibus diffusis, racemosis ; foliis superne integris anguste linearibus, basi at- 

 tenuates, radicalibus longe petiolatis, et pinnato-sectis, racemis densifloris, 

 floribus minutissimus, petalis ovato-lanceolatis, acutis calyce paulo excedenti- 

 bus, siliculis elliptico-ovatis apteris, valde emarginatis, glabris ; stylo bre- 

 visissimo. 



Near Fort Mason. June. 



1-2' feet high, divaricately branched, branches terminated by long racemes 

 of minute flowers ; sillicles a line in length, strongly emarginated ; the very 

 short style included. 



Caryophyllace.e. 



Arenaria (Alsine) monticola, s. nov. Annua, pumilla, parce pubescenti- 

 glandulosa, caulibus diffusis, foliis pumilis, obovatis, acutis, basi attenuatis, 

 subpetiolatis, petalis obovatis, acutis, calyce fere duplo brevioribus, sepalis 

 ovato-lanceolatis, acuminatisque scariosis ; floribus longe pedicellatis. 



Limestone, mountain tops middle and northern Texas. May. 



Glabrous or sparingly pulverulent pubescent; 6-10 inches high, diffusely 

 branched from the base ; leaves 3-4 lines long. 



Malvaceae. 



SidaSabeana, s. nov. Caule erecto,3-4 pedali tereti. Foliis ovato- 

 lanceolatis petiolatis, inequaliter dentatis, dentibus acutis, vel subobtusis 

 caulibus, petiolisque et pedicellis pulverulentis, floribus pumilis pedicel- 

 latis subpaniculatis, petalis oblongo-obovatis, sepalis ovato-lanceolatis, acu- 

 minatis. 



Prairies San Saba County. June. 



Divaricately and sparingly branched; leaves 1-1 i inches long; petioles 4 

 lines in length ; flowers yellow and crowded or solitary on short pedicels, ax- 

 illary, or at the extremity of the branches. 



Callirrhce p a 1 m a t a, s. nov. Caule prostrata, parce strigosa, foliis longe 

 petiolatis, reniformisque palmato 3-5 sectis, laciniis 3-5 fidis subobtusis acutis, 

 pedunculis erectis, axillaribus, solitariis, unifloris folio longioribus; calycis 

 hirsutis, lanceolatis, acuminatis, petalis obovato-rotundatis, albis, vel parum 

 caerulis, calyce duplo longioribus ; floret June. 



Common on Brady's Creek north of Fort Mason. Stems from a small, long, tap 

 root, creeping in different directions to the distance of 1-2 feet; leafy, radi- 

 cal and cauline leaves, similar, flowers, 1-lJ inches in diameter, generally 

 white, rarely of a pale purple ; peduncles 2J-3 inches long ; petioles -|-2 inches 

 long. 



Sidalcea A t a c o s a, s. nov. Tota planta hirsuta, caule erecta, ramis nu- 

 merosis foliis ovatis, plurime,et irregulariter sectis laciniis acutis; multittoris, 

 floribus axillaribus et capitatis, pedicellis calyce brevioribus, pedicellis brac- 

 teosis, valde hirsutis, coccis hirsutis, rugosis, subreniformis. 



On the Atacosa River in Western Texas. May. Stems about a foot high ; 

 lobes of the unequally divided leaves gash-toothed. Our specimens are in 

 fruit only. 



Malvastrum 1 i n e a r i folium, s. nov. Ramis, et foliis parce pilosis. In- 

 volucellum nullum, vel caducum, humile, foliis petiolatis, lineari-lanceolatis, 

 ad apice dentatis, bracteolis ad basi calycis numerosis, lineari-elongatis, 

 valde pilosis calyce longioribus ; segmentis calycis ovatis, acutis, floribus 

 glomeratis, axillaribus, seu capitatis, carpellis muticis. 



Northern Texas. May. 



Stems branching 6-10 inches high ; leaves about f of an inch long and 2-3 

 lines wide ; petioles 6-8 lines long ; flowers small, shortly pedicellate ; at the 



1861.] 30 



