Oirysogonum. COMPOSIT.E. 243 



B. tomentosa, Nutt. 1. c. Canescent throughout with soft and close pannose tomentuiu, 

 no liirsute or villous hairs, wlien glabrate hardly at all scabrous : stem a foot or two high, 

 rarely only a span high : leaves aU obtuse, green above, generally whitish beneath ; radical 

 and lower cauline elongated-oblong and petioled ; upper cauliue usQally ovate-oblong or oval, 

 sometimes subcordate-ovate, shortrpetioled or sessile heads fewer, in low specimens almost 

 solitary and longer-peduncled. — Torr. & Gray, Fl. ii. 28i. B. pumi/a, Satt. I.e. ."^i/j^hiiim 

 piimilum, ^lichx. Fl. ii. 146. .S. tomentosum, pumilum, & reticulatum? Pursli, Fl. ii. .57s, 579. 

 -S. Asteriscas, rar. pumilum, Wood, Bot. 442. Poli/mnia Carolinianaj Poir. Diet. v. 505. — 

 Dry pine barrens. X. Carolina to Florida, Arkansas, and Missouri. 



Var. dealbata, Toer. & Gray, 1. i. .Mure robust and leafy, 2 or 3 feet high, branch- 

 ing at summit and bearing more numerous and sliorter-peduncled heads : cauline leaves 

 broader and more sessile, densely white-tomentose beneath ; lower broadly cordate, upper 

 often deltoid (with or without a subcordate basej, either olituse or acute. — Texas, Drum- 

 mond. Hall, Rererchon, a very soft-canesceut form. Varies into a less canescent state, 

 approaching B. Texana, the leaves scabrous above (var. y, Torr. & Gray, 1. c), Arkansas, 

 Louisiana, and Texas. 



* * Stems commonly low and with long monocophalous peduncles ; the earliest often produced 

 from near the root, and scapiform, the later from leafy stems or branches : leaves variable, all 

 attenuate at base, dispu^ed to be piunatiiid or lyrate. 



B. subacaiilis, Kctt. 1. c. Barely cinereous with minute often hispidulous pubescence (or 

 the peduncles sometiiiies hirsute), soon green, becoming afoot or so high and leafy: leaves 

 of oblong-linear or oblong-spatulate outline, irregularly sinuately or lyratel}' pinnatifid, with 

 short obtuse lobes : akenes narrowly obovate-oval, merely carinately costate on the inner 

 face. — Torr. & Gray, Fl. ii. 282. S!l[ihiiim subacaule, Xutt. in Am. Jour. Sci. \ . 301 ; DC. 

 Prodr. \. 512. 5. S'uttallianum, Torr. Ann. Lye. X. Y. ii. 216, as to .■^yu. — Florida, in dry 

 pine barrens ; first coll. by lT'j7"e. 

 .B. lyrata, Bexth. Canescent with minute white or gray tomentum: leaves at length 

 greenish above, variously lyrate-pinnatifid ; the lateral lobes oblong or narrower, obtusely 

 dentate, sometimes incised : akenes obovate, the costa of the inner face strongly carinate. 



— PI. Hartw. 17; Gray, PI. Fendl. 7S, & PI. Wriuht. i. 103. B. incisa, Torr. & Gray, Fl. 

 ii. 282. Si'lphiiiin Xiittallianum, Torr. Ann. Lye. X. Y. ii. 216, excl. syn. — Plains and hills, 

 ■\V. Texas and Arkansas to Arizona. (Mex.) 



Var. macrophylla. Radical leaves often a foot long, lanceolate-oblong or spatulate, 

 either merely crenate or pinnatifid at base : later flowering stems sometimes 2 or 3 feet high. 



— S. Arizona, Lt:iiLi!iun. 



72. CHBYS6G-ONUM, L. (Greek name of some plant in Dioscorides. 

 Linnfeus gi-ses the derivation of Ms genus from yjiva-o^, golden, and ym-v. knee ; 

 of no obvious application.) — Gartn. Fruct. ii. 430, t. 174 ; Lam. 111. t. 713 ; DC. 

 Prodr. Y. 510; Torr. & Gray, Fl. ii. 274; Benth. & Hook. Gen. ii. 350, excl. 

 syn. Jloonia, &c. ; Gray, Proc. Am. Acad. xvii. 21 C. Biotostephus, Cass. Diet. 

 xlviii. 543. — Single species : fl. spring and summer. 



"C. Virginianum, L. Perennial from creeping rootstocks and sometimes by runners, 

 pubescent, often hirsute, flowering acaulescently from the ground, alsci with stems a span to 

 a foot high, bearing 3 or 4 pairs of long-petioled leaves ; these ovate, mostly obtuse and 

 crenate ; cauliue rarely subcordate and-equaUing or shorter than their petioles, or the radical 

 obovate -ivith cuneate attenuate base : peduncles solitary in the forks and terminal, all bvit the 

 radical ones elongated : involucre one-third and yellow rays half inch long. — Spec. ii. 920 

 (Pluk. Aim. t. 83, f. 4, & 242, f. 3); \Yalt. Car. 217; ilichx. FL ii. 143; Torr. & Gray, 1. c. 

 C. rirgmianum & C. Diotosteplms, DC. 1. c. Diotostephus repens, Cliss. 1. c. — Dry ground, 

 S. Pennsvlvauia to Florida. Varies considerably according to age and season, usually low 

 when blossoming begins. 



Var. dentdtum, Gray. Leaves deltoid-ovate, acute, coarsely dentate-serrate, the tip 

 and teeth, also the tips jif the bracts of the outer involucre, terminated by a more conspicu- 

 ous call .us mucro. — Bot. Gazette, viii. 31 . — High Island at the falls of the Potomac above 

 Washington, /. Donnell Smith, Ward, Vasey. 



