NATURAL SCIENCES OP PHILADELPHIA. 457 



12 18 inches high; leaves alternate f 1 inch long; whole plant rigid; 

 flowers f of an inch in diameter. 



Aplopappus 1 i n e a r i f o 1 i u s, s. nov. Tota glabra ; caule diffuse ramo3is- 

 simo, striato ; foliis lineari-elongatis, sessilibusque acutis ; involucri squamis, 

 3-serialis, lanceolatis acutis; pappo albo, setaceo, receptaculum, planum alveo- 

 latum; achenia cylindrica, striata, parum sericea. 



Llano County. June. 



Stems procumbent, and branches extending 1 2 feet ; leaves about a line in 

 width and an inch long, alternate and numerous; flowers few, ^ an inch in 

 diameter ; receptacle deeply alveolate, and margins of the cells chaffy. 



Parthenium 1 o b a t u m, s. nov. Annua, caule herbaceo-ramoso, glanduloso ; 

 foliis sinuato-pinnati-fidis, lobis obtusis et submucronatis foliis superne sessili- 

 bus ; inferno petiolatis, utrioque pubescentibus, involucri squimis obtusissimis, 

 margine valde, et minute lacineatis, acueniis sericeis, obovatis, pappo paleaceo 

 breve aristato. 



Western Texas. June. 



About a foot high ; flowers numerous, glomerated at the ends of the branches. 



Aphanostephus p i 1 o s u s, s. nov. tlumile, ramosissime, utrinque pilosa ; 

 foliis linearis, basi attenuatis, acutis ; involucri squamis, lanceolatis, subulatis, 

 margine membranaceis, ligulis albis, linearibus involucri duplo tongioribus ; 

 achneiis teretibus, subarcuatis, striatis, pappo parvo duplo longioribus. 



Prairies north of Fort Belknap. May. 



3 6 inches higb ; leaves and flowers numerous, the flowering stem3 net 

 naked or elongated, the whole plant covered with white hairs which are dilated 

 at the base, and not appressed. 



Sericocarpus (Galatella) Woodhousii, s. n. Glabra, seu parum pubes- 

 cens ; foliis oblongo-linearis, mucronatis, subfasciculatis ; receptaculum angus- 

 tum, alveolatum ; alveolorum marginibus lacineato-dentatis ; corollae disci, 

 campanulato-tubulosae, limbo profunde quinque-dentato ; achenia dense stri- 

 goso-sericea, involucri squamis imbricatis, lineari-oblongis, disco brevioribus ; 

 floribus subcorymbosis numerosis. 



New Mexico. Dr. Woodhouse. 



Leaves somewhat fasciculated, varying in size from an inch to 2 inches 

 long and 1 3 lines in width, not rigid ; stem about 2 feet high, with a few 

 branches near the summit. Flowers in August. 



Lepachys s e r r a t u s, s. nov. Valde pubescens ; foliis interrupte pinnati- 

 sectis ; segraentis ovatis aut lanceolatis, profunde serratis ; superne sessilibus ; 

 interne petiolatis et lyrato-sectis ; involucri squamis i-serialis longe linearis, 

 hirsutis ; discus elongatus, cylindricus, involucro vel ligu'.ae longior ; floribus 

 raris, longe pedunculatis. 



Near Camp Colorado. June. 



Several erect root-stems, 2 3 feet high, with few branches ; leaves 2 4 

 inches long, the three terminal segments large and ovate, with large serratures ; 

 radical petioles margined with a few small mucronate lobes. Whole plant 

 hirsutely pubescent. 



Maegacola. Gen. nov. 



Capitulum multiflorum homogamum ; ligulis nullis ; flosculis hermaphroditis 

 tubulosis, 5-dentatis luteis ; involucrum campanulatum; squamis subaequalibus, 

 2 3 serialis, linearis, abrupte acutis disco brevioribus; receptaculum conicum, 

 nudum, parvum ; styli rami breve, apice pubescenti ; antherae inclusas ; achenia 

 conformia ; lineari-oblonga, subquadrangulata, glabra vel parum pilosa pappo 

 minute setuloso, coronata ; 4 6 setulis minutissimis. 



Margacola p a r v u 1 a. Annua, herbacea, glabra, humile 4 6 policar. valde 



1861.] 



