V. PLANTS ■\YRIGHTIAN^. Ill 



350. Oligogyne Tampicana, DC. Prodr. 5. p. 629, Sf Deless. Ic. Sel 4. t. 38 ; 

 Groi/, PL Fendl. j). 87, adnot. On the Rio Grande, Texas. — Besides the two 

 strong awns, as figured in the work above cited, there are commonly two or three 

 shorter intermediate ones. Many of the heads are subsessile. The genus appears 

 to be scarcely distinct from Blainvillea, on the one hand ; while, on the other, the 

 want of laciniate Avings to the ray-achenia and the shorter appendages to the style 

 alone distinguish it from Synedrella. 



351. Sana^talia Aberti, Gray, PI. Fendl. p. 87. Damp valleys near the Rio 

 Grande below El Paso ; Sept. " Flowers Avhite. Plant two or three feet high." The 

 specimens are less than a foot high, from an annual root. Leaves sometimes linear. 

 The fruit as described in PI. Fendl., from Lieut. Abert's specimens. The disk is 

 greenish ; the palese lanceolate, cuspidate, rather rigid, and longer than the floAvers. 

 Ligules at most tAvo lines long. The species is remarkable for the extremely short 

 and conical awns to the ray-achenia.* 



Pappus nuUus. — Herbse glabroe ramos8e (basi suffrutescentes ?) ; foliis oppositis petiolatis ovato-laticeolatis 

 subtriplinerviis dentibus callosis serrulatis; capitulis terminalibus corymbosis ; floribus albis. 



1. G. Mexicana : foliis lanceolato-ovatis basi subcuneatis truncatisve triplinerviis serratis, serraturis 

 appressis ; iavolucro oblongo-campanulato, squamis oblongis obtusis ; ligulis 3-5, tubo inferne villoso, fl. 

 disci 10- 15. — G. Mexicana, Hitmh. Sf Bonpl. ! PI. ^q. 1. p. 144. «. 41 ; H. B. K. Nov. Gen. ^ Sp. 

 4. p. 247. — Mexico ; province of Michoacan, Humboldt. — The specimen in the herbarium of the Paris 

 Museum is poor and young. Heads three or four lines long. 



2. G. ATKiPLiciFOLiA (sp. nov.): foliis triangulato-lanceolatis hastatisve acuminatis basi 5-7-nerviis 

 argute serratis, serratulis subulatis inferioribus paucis laciniato-eloiigatis patentibus ; involucro breviter 

 campanulato, squamis late ovalibus abrupte mucronato-acuminatis ; ligulis 3 (-5 .') tubo glabro ; fl. disci 

 15-20. — Morelia, Mexico, GaleoUi, No. 2418 (v. sp. in Mus. Par.) ; at an elevation of 7,000 feet. — 

 The root is annual. The flowers are stated by the collector to be white. The tube of the ray-corolla is 

 scarcely longer than the broadly oval nine-nerved ligule. Achenium as in the next species, but perfectly 

 glabrous. 



3. G. TnLocARPus : foliis oblongo-lanceolatis basi obtusis vel acutinsculis calloso-serrulalis ; capitulis 

 fasciculato-confertis ; involucro eyiindrico angusto, squamis lineari-oblongis acutis ; ligula solitaria tubo 

 glaberrimo; fl. disci 4-5. — Tulocarpus Mexicanus, Hook. Sf Am. Bot. Voy. Beech, p. 298, /. 63. — 

 Tepic, Mexico, Lay ^ Collie. Between the city of Mexico and Mazatlan, Gregg. — Probably No. 2407 

 of Galeotti's collection from Zimapan, which I have seen in the Paris herbarium, belongs to this species. 

 Involucre three lines long, less than a line wide, looking like that of a Tagetes or a Stevia. Achenia mi- 

 nutely hairy under a lens. The flowers are stated by Hooker and A rnott to be yellow, but Dr. Gregg 

 noted that they are white. The styles I find to be deeply two-cleft. 



* Sanvitalia procumbens, Lam. is inadvertently described by De Candolle as having the exterior 

 (instead of the inner) disk-achenia winged and aristellate. The outer ones are wingless and e.xaristate, as 

 stated in the generic character and as figured by CavaniJles, &c. 



S. ocymoides, DC. requires to be again examined. An authentic (unless misplaced) specimen of 

 Berlandier's plant, which I possess, has the ligules by no means " very small," but longer than the awns of 

 the ray-achenia, the exterior disk-achenia roughened and awnless, the inner ones surrounded with a 

 continuous ciliate wing and mostly biaristellate ; — indeed, it is not to be distinguished from S. procum- 

 bens. 



S. acinifolia, DC. was gathered by Gregg near San Luis Potosi (No. 577), but with the innermost 

 achenia slightly, if at all, winged. 



S. tragiccfolia, DC, which has more hispid and rough foliage than the others, and very short ligules, 

 only half the( length of the conspicuous awns, was gathered at Walnut Springs, near Monterey, by Dr. 



