392 Lxxm. COMPOSITE (olivee and hiern). [Coreopsis, 



compressed, J-^ in. long, with 2 thick pale rounded setnlose lateral 

 ridges without wings. Aristas broadly subulate from a broad base, 

 shorter than or nearly equalling the achene, minutely ciliate. 

 Vile Iiand. Abyssinia, Schimper/ 



TTNKNOWN SPECIES OF COREOPSIS. 



Coreopsis Borianiana, Schultz Bip. in Schweinf. et Aschers Ennm. p. 284, name 

 only, from Sennaar. 



C. Buchingeri, Schultz Bip. I. c. name only, from Abyssinia. 



C. ccdlosa, Schnltz Bip. /. c. name only, from Abyssinia, 



C. involucrata, Schultz Bip. I. 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 $ 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-^ retrorsely barbed aristae. — Herbs with 

 opposite pinnati- or ternati-sect or undivided leaves and solitary or 

 ^oosely 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. PsELocABPJEA. Achenes much narrowed upwards, quad- 

 rangular, tipped with usually 3 or 4 setae. 

 Leaves pinnately lobed or undivided. 



Glabrous or sparingly hairy 1. B. pUosa, 



Scabrid-pilose, especially above 2.. B. qttadriseta. 



Leaves bipinnately lobed Z. B, bipinnata. 



§ 2. Platycabp-ea. Achenes much compressed, striate, not 

 much narrowed to the truncate apex, tipped with usually 

 2 setae only. 



Lobes of the leaves ovate oval or lanceolate 4.5. Schimperi. 



Lobes of the leaves narrowly linear b. B. lineariloba. 



1. 8. pilosa, Linn. Sp. PI., ed. i., p. 832. An erect annual, 

 3-60 in. high, glabrous or somewhat pilose. Stem and branches 

 quadrangular. Leaves ovate, mostly pinnately lobed occasionally 

 undivided, 1-8 in. long including the petiole, which ranges up to 

 2^ in., membranous ; lobes 1-5, opposite with a terminal one, ovate or 

 lanceolate, acuminate, shortly stalked, serrate or iucisely toothed, 

 ranging up to 3^ by 2 in. Capitula hemispherical ^— ^ in. diameter in 

 flower, elongating and widening upwards in fruit, on peduncles or pedi- 

 cels of |— 6 in., in a lax open corymbose cyme. Involucral bracts linear, 

 glabrous ciliate or pubescent, acute or subobtuse, J-J in. long, lax and 

 spreading in fruit. Disk-florets yellow. Ligule of the ray-floreta 

 white, sometimes wanting. Achenes slender elongated and gradually 

 tapering towards the apex, glabrous setulose or minutely tubercled, 

 those of the disk ;J— j in. long, the outer ones shorter, not or scarcely 



