982 



FLORA. 



51. CHRYSOGONUM L. 



Pubescent perennial herbs, with opposite and basal petioled leaves, and slender- 

 peduncled axillary and terminal, rather large heads of both tubular and radiate 

 yellow flowers. Involucre hemispheric, its bracts in 2 series of 5, the outer large, 

 obovate or spatulate, foliaceous, the inner oval, firm, each subtending a pistillate 

 ray-flower. Receptacle chaffy, each scale subtending and partly enclosing a per- 

 fect but sterile tubular flower with a 5 -toothed corolla. Anthers nearly entire at 

 the base. Achenes obovate, compressed, their margins acute, not winged, 1 -nerved 

 on the back, 1-2-ribbed on the inner side. Pappus a short half-cup-shaped crown. 

 [Greek, golden-knee.] A monotypic genus. 



1. Chrysogonum Virginianum L. Chrysogonum. (I. F. f. 3871.) Peren- 

 nial by rootstocks or runners, pubescent or hirsute throughout, branched from the 

 base, or at first acaulescent, 7-30 cm. high. Leaves ovate or oblong, obtuse or 

 acutish at the apex, the upper sometimes subcordate at the base, crenate-dentate, 

 rather thin, 3-7 cm. long, 1-2.5 cm. wide, peduncles 3-10 cm. long ; heads 2.5-4 

 cm. broad; outer bracts of the involucre obtuse ; rays about 5, 8-14 mm. long. 

 In dry soil, southern Penn. to Fla. April-July. 



Chrysogonum Virginianum dentatum A. Gray. Leaves dentate, the teeth and acutish 

 apex mucronulate ; outer bracts of the involucre acute. High Island, Potomac River, 

 near Washington. 



52. BERLANDIERA DC. 



Perennial canescent or pubescent herbs, with alternate leaves and rather large, 

 peduncled heads of both tubular and radiate yellow flowers. Involucre depressed- 

 hemispheric, its bracts imbricated in about 3 series, the outermost small, mostly 

 oblong, the second series broader, oval or obovate, the inner membranous, similar, 

 reticulated when mature, subtending the ray-flowers and exceeding the disk. 

 Receptacle nearly flat, chaffy, the chaff subtending the disk-flowers. Ray -flowers 

 5-12, pistillate, fertile. Disk-flowers perfect, tubular, sterile, their corollas 5- 

 toothed. Anthers entire, or minutely 2-toothed at the base. Style of the tubular 

 flowers undivided, hirsute. Achenes obovate, compressed, not winged, i-ribbed 

 on the inner side, the pappus obsolete, early deciduous or of 2 cad-ucous awns. 

 [Named after J. L. Berlandier, a Swiss botanical collector in Texas and Mexico.] 

 About 5 species, natives of the southern U. S. and Mex. 



Stem leafy ; leaves ovate to oblong, crenate. 1. B. Texana. 



Plant acaulescent, or nearly so ; leaves lyrate-pinnatifid. 2. B. lyrata. 



i. Berlandiera Texana DC. Texan Berlandiera. (I. F. f. 3872.) 

 Hirsute-pubescent throughout ; stem erect, branched above, or simple, 6-9 dm. 

 high, leafy. Leaves acutish or obtuse at the apex, rounded or cordate at the base, 

 5-10 cm. long, 3-5 cm. wide, the upper sessile, the lower petioled ; heads few or 

 several, 3-4 cm. broad, in a terminal corymbose-cymose cluster ; inner bracts of the 

 involucre twice as large as the outer. In dry soil, Mo. and Kans. to Ark. and 

 La. July-Aug. 



2. Berlandiera lyrata Benth. Lyr E-LE A VED BERLANDIERA. (I. F. f. 3873.) 

 Finely whitish-canescent; scapes or peduncles slender. 7-20 cm. long, bearing a 

 solitary head, or rarely 2. Leaves lyrate-pinnatifid, obtuse, petioled. the terminal 

 segment usually larger than the lateral ones, the lower ones very small, all obtuse] 

 mostly crenate, sometimes becoming green and glabrate above; head about 25 mm. 

 broad; inner bracts of the involucre much broader than the outer, orbicular, or 

 wider than long. In dry soil, Kans. to Tex., Ariz, and Mex. 



53. ENGELMANNIAT.&G. 



Perennial hirsute herbs, with alternate pinnatifid leaves, and corymbose slender- 

 peduncled rather large heads of both tubular and radiate yellow flowers. Invo- 

 lucre hemispheric, its bracts imbricated in 2 or 3 series, the outer linear, loose, 

 hirsute* ciliate, the inner oval or obovate, concave, appressed, subtending the ray- 

 flowers. Receptacle flat, chaffy, the chaff subtending and partly enclosing thedisk- 

 Rays 8-IO, pistillate, fertile. Disk-flowers about as many, tubular, pen 

 feet, sterile, the 'corolla 5 -toothed. Anther- minutely 2-dentate at the base. Style 



