VI. PLANTS WRIGHTIANiE. 95 



in the Cambridge Botanic Garden, from seeds collected by Mr. Wright in Sonora. 

 — The cultivated plants are one or two feet high, much branched and bush-like, 

 annual : the cauline leaves piunately 5 - 7-parted, or the upper 3-parted ; the ra- 

 meal mostly entire, narrowly linear. Involucre somewhat clavate and quadran- 

 gular, 3 lines long, nearly equalling the flowers, subtended with one or two small 

 bractlets ; the scales 4 or 5, obovate, their scarious tips tinged with purple. Corollas 

 yellow, a line and a half long ; those of the hermaphrodite flowers 4 - 5-toothed ; 

 that of the solitary female flower when present not longer than the others, and 

 imperfectly ligulate ; being 2-lipped, the inner lip small and entire, the outer, or 

 ligule, involute, 2 - 3-toothed at the apex, about the length of the style. Achenia 

 2 lines in length, more or less villous or glabrate on the four sides, very strongly 

 villous on the angles. Palese of the pappus, including the short projecting awn, 

 not longer than the corolla, somewhat erose, the obtuse apex often splitting away 

 from the base of the awn, so as to appear " trifid." — I cannot doubt that this is 

 De Candolle's Hopkirkia, which must be reduced to Schkuhria, as remarked in PL 

 Fendl. p. 96. The Schkuhria Wislizeni (to which belongs Galeotti's No. 204:9), 

 which I there characterized, is to this exactly what S. abrotanoides is to S. octo- 

 aristata ; and the following, which I unwillingly characterize as a species, difiers 

 only in its rather small, entirely nerveless and awnless pappus. 



S. Wrightii (sp. nov.) : capitulis 3 - ;5-floris, flore unico focmineo, ligula brevis- 

 sima imperfecta ; acheniis ad angulos villosissimis ; pappi paleis 8 obovato-oblongis 

 conformibus enerviis muticis corolla paullo brevioribus. — On the Sonoita near De- 

 serted Rancho, Sonora; Sept. (1254.) — This is to Schkuhria Hopkirkia and 

 S. Wislizeni exactly what S. isopappa, Beiith. is to S. octo-aristata and S. abrota- 

 noides. It is therefore highly probable that the difference in the pappus, although 

 constant in the specimens, is not of specific importance ; and that the three Peru- 

 vian species should be viewed as forms of S. abrotanoides, and our three Mexican 

 plants as analogous forms of S. Hopkirkia. S. virgata, DC, with its very unequal 

 pappus and nearly naked achenia, is distinct from either.* 



Bahia absi>^thifolia, Betith., var. dealbata, Graj/, PL Wright, p. 121. Sandy 

 valley in the Mimbres mountains ; July: near Frontera ; March. (1255.) 



B. BiTERNATA (sp. uov.) : auuua, cinereo-puberula ; caule erecto gracili superne 

 corymboso-paniculato, ramis oligocephalis ; foliis altcrnis petiolatis bitcrnatiscctis, 

 segmentis linearibus obtusis sa-pius 2 - 3-lobatis ; involucre laxo disco breviore, 

 squamis 12 obovatis obtusis ; acheniis hirsutis ; pappo e paleis 12-14 uninerviis, 

 fl. exteriorum obovatis muticis tubum corolliE adajquantibus, fl. interiorum oblongo- 

 lanceolatis aristatis corolla subdimidio brevioribus. — Gravelly hills near Ojo de 

 Gavilan, New Mexico; Aug. (1256.) — Plant one or two feet high, loosely and 

 paniculately branched; the heads corymbose, on peduncles of an inch or less m 

 length. Segments and lobes of the leaves a line or less in width. Involucre as in 

 B. ambrosioides and B. pedata ; the scales about 3 lines in length, membranaceous. 



* Achyropappus anthemoides, H. B. K. is wholly intermediate between Schicuhria and Bahia, Lag., 

 and will certainly fall into the one or the other genus. 



