PLORA OP NORTH-WESTERN MEXIOO. 
19 
Subgenus II. MACEOCEPHALiE, Sz. Bip. Capitula multiflora, pollicem cire, longa ; involucrum valde 
imbricatum, folia coriacea. 
408. Teixis turbinata, Sz. Bip. ms. — Perezia turbinata, Lai. et Lex. Nov. Gen. Veg. vol. i. p. 
25. A. Gray ! Pl. Wright. vol. i. p. 126. — Acourtia formosa, Don (non DC.) Trans. Limi. Soc. 
vol. xvi. p. 204.— Acourtia macrocepliala, Sz. Bip. in lit. ad cl. Seem. (Tab. LV.) Herbacea, gla¬ 
berrima, caule apice capitulis paucis (5) speciosissimis, 1 j poli, diametro met. terminato, foliato, 
foliis coriaceis, lanceolatis, falcatis, cordatis, acutis, dentato-spinosis. Sierra Madre (n. 2034). 
Obs. Lai. et Lex. 1. c., folia ovata describunt ! Cum cl. Gray! 1. c., plantas nostrae speciosissimae, invo¬ 
lucro exquisite turbinato instructae, pappi radios apice vix incrassatos vidi non vero penicillatos ut 0. Don 
1. c. asserit. An plures species confusae ? 
Plate LV. Fig. 1, portion of lower stem ; 2, receptaculum; 3, corolla; 4, antliers ; 5, an entire flower ; 
6, hair of tlie pappus ; 7, pistil:— ali, witli the exception of 1 and 2, magnified. 
Subgenus III. Polycephal;e, Sz. Bip. ms. Capitula mediocria, 8-12-flora, in paniculam corymbosam 
polyceplialam disposita. 
409. Trixts Seemannii, Sz. Bip. ms .—Perezia Seemannii, A. Gray! Pl. Wright. vol. i. p. 127. — 
Acourtia Seemannii, Sz. Bip. in lit. ad cl. Seem. (Tab. LIV.) Herbacea, rigida, glaberrima, panicu- 
lato-ramosissima, polycephala, foliis coriaceis, confertis, cuneato-oblongis, acutiusculis, inferne inte¬ 
gris, ceterum spinuloso-dentatis, rameis, minimis, obovato-oblongis, integris, mucronatis. (Species 
distinctissima, capitulis 12-floris, achseniis papilloso-scabris, 2 lin. longis, pappo denticulato, 4 lin. 
longo.) Sierra Madre (n. 2033) . 
Piate LIV. Pig. 1, portion of the lower stem; 2, an entire capitulum; 3, receptaculum; 4, upper 
part of corolla; 5, an entire flower; 6, stamen; 7 , ovary; 8, stigma; 9, hair of pappus :— ali, with the ex¬ 
ception of fig. 1, magnified. 
410. Tb.ixis patens, Sz. Bip. ms.— Perezia patens, A. Gray ! Pl. Wright. vol. i. p. 1.27. exci. var. 
— Acourtia formosa, Sz. Bip. in lit. ad cl. Seem. (Tab. LVI.) Herbacea?, glaucescens, glaberrima, 
pateuti-ramosissima, ramis corymbosis, foliis oblongis, cordatis, apice rotundatis, omnibus conferte 
spinulosis. Sierra Madre (n. 2032) . 
Obs. Acourtia formosa, DC. Prod. vol. vii. p. 66, see. diagnosin huc spectare videtur, licet amic. Gray, 
1. c. p. 126, eam cum Perezia ( Trixide fruticosa, Sz. Bip., ms.) fruticosa, Lai. Lex. Nov. Veg. vol. i. p. 26, 
jungat. Cl. Lai. et Lex. nempe P.fruticosce attribuunt capitula confertissima, involucrum cylindraceum, 
caulem purpurascentem, folia subrotunda, floralia edentula. Nostra vero habet capitula vix contigua 4-8 
ad ramorum apicem pedicellis gracilibus, iis pl. longioribus, insidentia, involucrum ovato-hemisphaericum, 
folia oblonga, subaequilata, obtusa, etiam summa crebre spinuloso-dentata. 
Peate LVI. Pig. 1, receptaculum ; 2, corolla; 3, an entire flower ; 4, stamen ; 5, pistil; 6, stigma; 7, 
hair of pappus : — adi magnified. 
