Apogon. composite. 467 



(or sometimes very minute and chaffy. DC.) — An annual glabrous or some- 

 what glaucous small herb, 4-12 inches high, branched from the base ; the 

 branches slender, erect or ascending, bearing 1-3 or several umbellate slender 

 pedicels at the summit, and also frequently in the axils of the cauline leaves, 

 mostly a little hispid near the summit, terminated by single small heads. 

 Radical leaves obovate-oblong or lanceolate, entire or sparingly toothed, the 

 primordial nearly sessile, the others tapering into petioles ; cauline lanceo- 

 late, acute or acuminate, entire, sessile, partly clasping ; the uppermost 

 mostly opposite ! Flowers yellow. 



A. humilis (Ell. ! 1. c.) — A. humilis & A. gracilis, DC. ! I. c. 



0. lyrata: radical and lower cauline leaves (either some or all of them) 

 variously lyrate-toothed or pinnatifid. — A. lyratum, iVziW. / in jour. acad. 

 Phiiad. 7. p. 71, 4' i^ trans. Amer. phil. soc. (n. ser.) 7. p. 424. Serinia 

 caespitosa, Raf. fl. Ludov. p. 149 ? {DC. prodr. 7. p. 261.) 



South Carolina ! Georgia ! and Florida ! to Louisiana ! Arkansas ! and 

 Texas ! /?. Louisiana, Drummond ! Dr. Hale ! Plains of Arkansas, Nut- 

 tall, Dr. Pitcher ! dec. Texas, Drummond .' April-June. — "We cannot dis- 

 cover the 'minute chaffy pappus' in an original specimen of A. gracilis, 

 DC, nor find any appreciable difference in the achenia. In both Elliott's 

 and Nuttall's plants, also, the pedicels are frequently furnished with bristly 

 hairs towards the summit; and the irregular incision of the leaves in the latter 

 is very inconstant. 



Subtribe 2. Htoseride^:, Less. — Receptacle not chaffy. Pappus sim- 

 ple or double, either wholly or partly chaffy, squamellate, or coroniform. 



179. KRIGIA. Schreb. gen. p. 532; Willd. ; DC. prodr. 7. p. 88. 



Heads 15-30-flowered. Scales of the involucre 6-15, somewhat in a 

 double series, equal. Receptacle naked. Achenia turbinate, many-stiiate, 

 somewhat 5-angular. Pappus double ; the exterior of 5 broad and rounded 

 scarious chaffy scales ; the inner (rarely wanting) of as many slender sca- 

 brous bristles alternating with the scales, and corresponding with the angles 

 of the achenium. — Small annual (North American) herbs, branching from 

 the base ; the mostly lyrate or toothed leaves radical or nearly so; the naked 

 branches or scapes long and slender, simple, terminated by solitary small 

 heads. Flowers yellow. 



§ 1. Bristles of the papjms more or less exceeding the chaffy scales, but not 

 longer than the terete achenium, sometimes entirely wanting : scales of the 

 involucre 5-8, with a strong midrib, erect and carinate-navicular in fruit. — 

 Ctmbia. 



1. K. occidentalis (Nutt.) : scapes very numerous from the same root, 

 diffiise, simple, leafless, hispid ; leaves either entire or lyrate ; the exterior 

 with the lamina or terminal lobe oval or roundish ; the innermost lanceolate 

 or narrowly linear ; achenia equally many-ribbed, ciliolate-scabrous on the 

 ribs which correspond with the bristles of the inner pappus, very minutely 



