I 



TI. 



PLANT^ WRIGHTIAN.I:. 



79 



lowing plant, however, with much the habit of an enlargcd Gymnospcrma, has 

 short and broad appendages to the style. Yet I cannot separate it from tbe geniis 

 Grutierrezia. 



G. 1 (Hemiachyris) GTiiNospERMoiDES (sp. nov.) : caule herbaceo valido subsim- 

 plici; foliis lanceolatis vel oblongo-Ianccolatis inferne attenuatis apicem versus 

 scepius denticuiatis mucronato-acutis glutinosis penninerviis ; capituUs confertissime 

 corymbosis hemisphsericis fere omnibus pedicellatis ; invohicri squamis linearibus 

 acutis ; receptaculo planiusculo ; HguHs 25 - 30 angustis discum vix superantibus ; 

 ii. disci 40 - 60 ; acheniis radii glaberrimis calvis, disci minute hirteUis pappo co- 

 roniformi dentato lacero et in fl. centralibus setoso-paleaceo superatis. — Low banks 

 of the San Pedro, Sonora ; Sept. (1178.) — " Stem 2 to 4 feet high," very leafy to 

 the top, terete. . Leaves about 3 inches long, 4 to 6 lines wide, rather thin, rather 

 obscurely feather-veined. Heads very numerous, cymose-crowded at the summit of 

 the stem and of the short flowering branches, forming an ample compound corymb. 

 Involucre glutinous, hemispherical, about 3 lines in diameter ; the scalcs with loose 

 or spreading tips. Eeceptacle nearly flat, alveolate. Ligules linear-oblong, not 

 longer than their filiform tube. Appendages of the style in the disk-flowers ovate- 

 triangular, acute. Achenia oblong, comjn-essed ; those of the ray perfcctly glabrous, 

 with a small terminal areola, entirely destitute of pappus ; those of the disk mi- 

 nutely and sparsely hairy, with a toothed and lacerate coroniform pappus, wliich 

 in the exterior flowers is very short, or sometimes obsolete, in the central flowers 

 larger and often produced into 4-8 unequal rigid setiform palete, the larger occa- 

 sionally nearly as long as the achenium. 



G. (HEMiACHynis) SPH.EROCEPHALA, Grai/, Pl. Fendl. p. 73. Banks of tlie Hio 

 Grande near El Paso ; June, in flower. Hills near the copper mines, New Mexico ; 

 Oct. (1179.) — Eoot annual! Stems a span to a foot high, diffusely very inuch 

 branched, bearing very numerous solitary heads ; the upper leaves reduced to subu- 

 late bracts. Heads 2 lines in diameter. Achenia turbinate, silky-villous, cspccially 

 on the 10 strong ribs. Pappus in these specimens all truly coroniform, as long as 

 the proper tube of the disk-corollas, fully half the length of the achenium, irrcgu- 

 larly 4 - 5-Iobed or toothed ; the lobes mostly obtuse, short, erose. — Those from 

 the copper mines are well-developed specimens of the same plant as Fendlefs No. 

 343," which was immature. No. 315 of CouIter's Mexican collection may be a 

 variety of this, witli the palese much less concreted. G. eriocarpa difFers princi- 

 pally in the multipaleate pappus. 



G. 'MicRocEPHALA, Grui/, Pl. Femll l. c, 8f Pl. Wright p. 94. Mountains at Gua- 

 dalupe Pass, New Mexico ; Oct. (1180.) 



S. MOLLis, Barfl Ind. Sem. Jlort. Goett. 1836; BC. Prodr. 1. p. 279. S. incana, / . 

 Torr. 4' Grai/, Fl. 2. p> 221 (cc & yS). Sides of mountains at the copper mines, ^^.^ 



New Mexico; Aug. and Oct. Also on the Limpio. (1181.) — It runs, I fear, 

 into S. nemoralis, and certainly is not distinct from S. nemoralis 7, Torr. §• Gray, 



S. PETioLARis, Aiti ; Torr. §• Grai/, l c. ; at least the plant of Pl. Wright. p. 94. 



With the prcceding. (1182.) 



S. occiDENTALis, Niitt. iu Torv. 8r Gray, Fl. 2. p. 226. Thickets, in the bottom 



of the Mimbres, New Mexico ; Oct. (1183.) 





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