392 LXXIII. COMPOSITA (OLIVER AND HIERN). [ Coreopsis. 
compressed, 2-} in. long, with 2 thick pale rounded setulose lateral 
ridges without wings. Ariste broadly subulate from a broad base, 
shorter than or nearly equalling the achene, minutely ciliate. 
Wile Land. Abyssinia, Schimper ! 
UNKNOWN SPECIES OF COREOPSIS. 
Coreopsis Borianiana, Schultz Bip. in Schweinf. et Aschers Enum. p. 284, name 
only, from Sennaar. 
C. Buchingeri, Schultz Bip. 7. c. name only, from Abyssinia. 
C. callosa, Schultz Bip. /. c. name only, from Abyssinia. 
C. involucrata, Schultz Bip./. c. name only, from Abyssinia. 
69. BIDENS, L.; Benth. et Hook. f. Gen. Pl. ii. p. 387. 
Capitula heterogamous radiate ; ray-florets ligulate 1-seriate 9 or 
neuter, occasionally wanting and the capitula thus homogamous. In- 
volucre sub-2-seriate, inserted around an often dilated receptacular 
disk, outer bracts often herbaceous, inner membranous. Scales of 
receptacle nearly plane or slightly concave. Anther-base entire or 
minutely sagittate. Style-branches with abrupt appendices. Achenes 
4-angled or compressed, linear or oblong, often elongate and narrowed 
upwards, crowned with 2-4 retrorsely barbed aristee—Herbs with 
opposite pinnati- or ternati-sect or undivided leaves and solitary oF 
Voosely cymose pedunculate yellow or white conspicuous capitula. 
A large genus of warm and temperate regions in both hemispheres. 
With one or two exceptions the following species are peculiar to this Flora. 
§ 1. Psrrocarpma. Achenes much narrowed upwards, quad- 
rangular, tipped with usually 3 or 4 sete. 
Leaves pinnately lobed or undivided. 
Glabrous or sparingly hairy . . . ......-. LB . 
Seabrid-pilose, especially above . . . . . . . . + 2 B. quadriscta. 
Leaves bipinnately lobed '. eer 3. B, bipinnaia 
§ 2. Puarycarpma. Achenes much compressed, striate, not 
much narrowed to the truncate apex, tipped with usually 
2 sete only. ; . 
Lobes of the leaves ovate oval or lanceolate . . . . » 4. B. Schimper. 
Lobes of the leaves narrowly linear. . . . . 5. B. Himeartioa, 
1. B. pilosa, Linn. Sp. Pl. ed. i., p. 832. An erect annual, 
3-60 in. high, glabrous be somewhat pilose. Stem and branches 
quadrangular. Leaves ovate, mostly pinnately lobed occasionally 
undivided, 1-8 in. long including the petiole, which ranges UP 
2 in., membranous; lobes 1-5, opposite with a terminal one, ovate or 
lanceolate, acuminate, shortly stalked, serrate or incisely toothed, 
ranging up to 34 by 2in. Capitula hemispherical }-} in. diameter 1> 
flower, elongating and widening upwards in fruit, on peduncles or pe@- 
cels of }-6 in., in a lax open corymbose cyme. Involucral bracts nee 
glabrous ciliate or pubescent, acute or subobtuse, 3-3 in. long, jax ant 
spreading in fruit. Disk-florets yellow. Ligule of the ray-flores 
white, sometimes wanting. Achenes slender elongated and gradus’y 
tapering towards the apex, glabrous setulose or minutely tubercl iy 
those of the disk }~-? in. long, the outer ones shorter, not or scarce y 
