OF ARTS AND SCIENCES. 31 



P. Hookeriana, the Palafoxia Hooheriana, Torr. &. Gray, FI., and of 

 Hook. Bot. Mag. t. 5549. The third section, for the original species, 

 P. integrifolia, Nutt., has a large homogamous head, a short-campanu- 

 late throat between the long lobes and the tube of the corolla, slender 

 akenes, a more imbricated and largely whitish-scarious involucre, and 

 a perennial root.* 



AcTixELLA (Plateilejia) Palmeri. Depressa, subcsespitosa e 

 caudice multicipiti perenni ; foliis confertis pinnatifidis cum caulibus 

 brevibus glabris, lobis subovatis ; pedunculis gracilibus subscapiformi- 

 bus monocephalis ; invokicri bracteis subovatis ciliatis ligulisque G-S ; 

 acheniis secus nervos 4-5 liirsutis, maturis glabratis. — Peculiar in the 

 genus by the following sectional characters: Tnvolucrum oligophyllum, 

 fere herbaceum, subbiseriale, phyllis ima basi subcoalitis. Recepta- 

 culum convexum. Pappi palea3 4-5, chartaceo-scariosa', quadratic, 

 enervia3, ima basi crassiores, apice truncato laciuiataj nunc fissiles, 

 corollis disci dimidio breviores. Folia impunctata et globulis resinosis 

 destituta, querciformia. — Near Saltillo, State of Coahuila, Mexico, 

 April, 1880, no. 554, coll. Palmer. \ 



AcTiNELLA INSIGNIS. A. chrysanthemoidei sat similis ; radioe 

 bienni crasso ; caule robusto bipedali ramoso polycephalo ; foliis 2-3- 

 pinnatipartitis impuuctatis, lobis angusto-linearibus, petiolis magis 

 complanato-dilatatis ; pedunculis fistulosis ; iuvolucri bracteis lineari- 

 bus laxioribus ; receptaculo convexo ; pappi paleis 5 lato-ovatis muticis 

 diametrum achenii baud .superantibus. — Coahuila, Mexico, at Lerios, iu 

 the mountains east ot Saltillo, at 10,000 feet, July, 1880, no. 632, 



* Palafoxia Feati, Gray, Proc. Am. Acad. xii. 59, is certainly a connecting 

 species, the corolla-lobes being fully lialf tlie length of the cylindraceous throat, 

 and the tips of the involucral bracts obscurely sphacelate. 



P. linearis, Lag., includes P. leucophylla, Gray, Proc. Am. Acad. viii. 291, as a 

 shrubby form, with reduced pappus. In cultivation it produced elongated and 

 e.xcurrently costate pappus-paleaj ; and the original species is described as 

 shrubby. 



P. latifoJia, DC, of Soutliern Mexico, is apparently unknown to recent bota- 

 nists, but, having " opposite cordate leaves," it can hardly be of tliis genus. 



t ACTINEIvLA, Pers., Nutt., name changed, as was at the time thought 

 necessary, from Actinea, Juss. Hymenoxys, Cass., DC. Actinella, Hi/menoxi/s, and 

 a part of Cepliulophom, Benth. & Hook. I have insisted upon the maintenance 

 and full development of this genus in Planta? Fendlerianffi, Plantaj AYrightiana?, 

 and later in Proc. Am. Acad. xiii. 373. It has now a good number of species, 

 which fall into three natural sections, the first of which is new : — 

 § 1. Platkilema. Involucrum oligo- et platyphyilum : receptaculum con- 

 rexum : pappi palete (4-5) quadrataj, truucato-laciniataj, fissiles. 



A. Palmeri, vide supra. Northern Mexico. 



