Lactuca. | LXXIII, COMPOSITH (OLIVER AND HIERN). 451 
sagittate; auricles acute or shortly setaceous-acuminate. Achenes 
oval or oblong, all similar, more or less compressed, narrowed at the 
base, terminating in a short beak or long neck, 4-10-costate. Pappus 
copiously setose, in many rows, persistent or deciduous in one piece.— 
Herbs, usually glabrous, with milky sap, alternate or radical leaves 
and yellow or blue flowers. 
A considerable genus, widely spread over the Old World and North America. 
The lettuce, Z. sativa, Linn., is cultivated in Nubia, Cordofan and Abyssinia. 
L. albiflora, Schultz Bip. in Schweinf. and Aschers. Enum. 285, from Sennaar, is 
unknown to us. 
Achenes fusiform, about 10-costate, tapering to a short beak 
(Brachyrhamphus). a 
Inner involucral bracts5 ........... OLD tarazacifolia, 
Inner involucral bracts 8 . . 2. L. goreensis. 
Achenes compressed, with thickened margin, 1 central vein 
oneach side, and very short beak . . 
. . . . . 8 DL, Schweinfurthii. 
henes compressed, terminating in a long slender neck 
(Scariola). 
Achenes 1-ribbed on each side. . 
Stem somewhat flexuous .......-... 42. capensis. 
Stem straight rigid . . . 2 eee 8 ZL, abyssinica. 
Achenes with several ribs on each side. 
Habit erect or ascending, not scandent. 
Inflorescence elongated. Pappus white. Usually ; 
somewhat setose-scabrid . . . - - + + - 86. ZL. virosa. 
Inflorescence diffuse or short. Pappus yellowish. 
Usually smooth. 
Heads numerous. . . . . . . + + + + + 4% ZL. Hochstetteri. 
Heads fewer, distant . . ... =. +. + + 8 L. rariflora. 
Habit scandent. 
Nearly glabrous . 2. ww ee et ee + Z. paradora. 
Hispid-glandular . 10. L. glandulifera. 
1. &. taraxacifolia, Schum. § Thonn. Beskr. Guin. Pl. p. 380. 
Root simple. Stem erect, glabrous, terete, glaucescent, unarmed, 2-6 
- high, simple below, with a cluster of leaves at the base. ‘Leaves 
Tuncinate, the upper rather acute, the lower rather obtuse, glabrous or 
nearly so, ranging up to more than 6 by 4 in. ; stem-leaves sessile, am- 
Plexicaul, the lowest ones narrowed into a short winged petiole ; lobes 
variable in breadth and depth, denticulate ; teeth usually callous, acute, 
like small prickles. Capitula about 20-flowered, 3—} in. long, on very 
ort pedicels, in panicled racemose cymes. Inner involucral bracts 
» obtuse, linear-oblong ; outer bracts imbricated, ovate, obtusely 
P Ointed, with scarious margins, varying up to about half the 
ie ag of the inner ones. Achenes dark, about 10-costate longitudi- 
Y, transversely rugulose, fusiform, 5, in. long, tapering to a 
short slender pale apex. Pappus 3 in. ‘og? Searly white.—DC. Prodr. 
Vi. p. 188. Schultz Bip. in Flora 1842, p. 422. Sonchus taraxacifolius, 
Willa, Sp. Pl. iii. p. 1511. S. serratus, Perr. ex DC. |. c. Microrhyn- 
chug pentaphyllus, Hochst. in Herb. Kotsch. Nub. n. 337. L. penta- 
f la, Schultz Bip. and L. Kotschyi, Schultz Bip. in Linnea xv. p 
hy 41). 8. pentaphyllus, Schultz Bip. in Schweinf. Beitr. Fl. 
thiop. p, 160, 
GG2 
