86 



PLANT^ WHIGHTIAN^. 



VI. 



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long, 



tbe lcaves are all alteniate, and clothecl, like the rest of tlie plant, with a fine and 

 ver)- soft velvety pubescence, and the larger heads (2-3 lines in diameter) are all 

 distinctly pcdicelled. Lcaves triplinerved ; the larger ones 6 to 8 inches long. Inner 

 scales of the involucre with scarious margins, nearly plane, not wrapped around the 

 achenia, nor adherent to them at the base. Corollas greenish, pubescent above ; 



r 



those of the fertile flowers scarcely half the length of the ovary ; those of the disk 

 stipitate on the abortive ovaries, funnel-form, 5-toothed. Achenia a line 

 rather shortcr than the purplish paleee that are attached to their base, one on each 

 side, and which, when detached, do not carry away the margins of the achenium 

 (asin Parthenium), except a bit at the base. Thepaleae are not broad enough to in- 

 close any sterile ilowers : those they subtend are deciduous, with the others. Pappus 

 none, except the minute paleaceous tooth at the pointed apex of the achenium. 

 Distinguished from Euphrosyne by the manifest and almost ligulate corolla of the 

 fertile flowers, the form of the achenium, and the subtending lateral paleee, &c. ; 

 from Parthenium by the less ligulate and deciduous ray-corollas, the reduction of 

 the palese of the disk to minute rudiments, and the want of a pappus. 



Ambrosia psilostachya, DC. Prodr. 5. p. 526; Grai/, Pl. Wright. adn. p. 104. 

 Low banks of the San Pedro^ Sonora; Sept. (1209.) 



Franseria tenuifolia, var. trifinnatifida, Gray^ Pl. Lindh, 2. p. 227, ^ Pl. 

 Wright. l. c. Alluvial prairies of the San Felipe, Western Texas ; May (a dwarf 

 form). Cooke's Spring, New Mexico ; and in Sonora; Sept, Oct. (1210.) 



F. Hookeriana, Nutt. Valley west of the Chiricahui Mountains, Sonora ; Sept. 

 (1211.) 



IIymenoclea monogyra, Torr. ^ Gray, Pl. FendL p. 79, %" PL Wright. l c. 



Pebbly bed of a mountain torrent, near Santa Cruz, Sonora; Sept. 

 " Branching from the root, 2 to 5 feet high." 



(1212.) 



ZiNNiA tenuiflora, Jacq. Ic. Rar. 3. t. 590; BO. ! Prodr. 5. p. 5S5. Z. inter- 

 media, Engelm. in WisL Mem. N. Mex. p. 107. Hills near Santa Cruz, Sonora; 

 Sept. (1213.) — The specimens w^cll accord wdth authentic ones of Z. tenuiflora 

 (the name of which is hardly appropriate), and like them are more or less pubes- 

 ceht, and with the peduncles very often neither elongated nor cylindrical. 



Z. (DiPLOTHRix) GRANDiFLORA, Nutt. ; Gray, Pl Wright. p. 105. Live Oak 



Creek, Western Texas, and between the Limpio and the Eio Grande. 



(1214.) 



Z, (DiPLOTHRix) puMiLA, Grog, PL FendLp. 81, ^ PL Wright. l c. Rocky hills 



near El Paso ; March. Heads of the Aqua Prieta, in mountains east of Santa Cruz, 

 Sonora ; Oct. (1215.) 



Z. (Heterogyne) anomala, var. Gray, PL Wright. Lc. t. 10./ 2. Alluvial i^rai- 

 ries from Chicon Creek, Western Texas, to the Pecos ; .May, July. (1216.) 



"Flowers dark orange." 



IIalea Texana, Grag, PL FendL p. 83, 8r PL Wright. L c. Stony hills, froin 

 San Felipe to the San Pedro, Texas; May. (1217.) 



Heliopsis PARViroLiA (sp. nov,): scabrella; caule gracili; foliis lanceolatis vel 

 subhastatis basi paucidcntatis (poUicaribus) ; pedunculis elongatis sub capitulo am- 

 pliatis; involucribrevissimi squamisoblongis obtusis; ligulis persistentibus ; acheniis 



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