230 
FLORA OF ADEN. 
1, Dicoma Scliimperi (DC.) O. Hoffm. in Engl.-Prantl Natiirl. 
Pflanzenfam. IV, 5, 339. 
H oehstetteria Scliimperi DC. Prodr. VII, 287 ; Anders. Journ. Linn. 
Sec. V ; Suppl. p. 22 ; Boiss. FI. Or. Ill, 219 ; Hook. FI. Brit. Ind. Ill, 
988 -Qliv. FI. trop. Afr. Ill, 444. 
Description : — An erect rigid, branched, perennial herb, 1 — 2 feet 
high ; branches slender, erect or ascending, angular, glabrous or pubescent. 
Leaves alternate, | — -2 by J — f inch, elliptic-oblong, subobtuse, muc- 
ronate, serrulate, araneously pubescent on both sides, attenuated at the 
base into a short, obscurely winged petiole. 
Capitula homogamous, solitary, terminal, discoid, \ — | inch in dia- 
meter « Flowers orange, all hermaphrodite. Involucre hemispheric ; 
bracts cc-seriate, narrow, acute, rigid. Corolla regular, tubular, limb 
5-partite, lobes more or less revolute. Anther-bases subciliate, the 
auricles produced into long tails. Style-branches linear, obtuse, flat- 
tened. Pappus of 10 stellately spreading palese with hyaline margins 
below the middle, slender and barbellate above, much longer than the 
achenes. 
Achenes turbinate, inch long, densely villous with long brownish 
hairs. 
Flowers and fruits : — Nov. 1889 (Schweinf.), Dec. 1847 (Hook.), Dec. 
1889 (Defl.), Feb. 1851 (Thomson). 
Locality : — Plain of Maala (Defl.) ; Goldmore Valley (Schweinf.); 
without locality (Hook., Birdw., Lunfc). 
Distribution : — Nubia, S. Arabia, Sind. 
7, Lactuca L. 
Glabrous (rarely hispid) usually milky herbs. Leaves radical and 
alternate, entire, coarsely toothed or pinnatifid, the margins setoso-ciliate 
or naked ; cauline leaves often amplexicaul and auricled. 
Heads variously paniculate, sessile or pedunculate, homogamous ; 
flowers all ligulate, yellow, purple or blue. Involucre cylindric, usually 
narrow ; bracts usually few-seriate, often with scarious margins, the 
innermost elongate, subequal, the outer often very short. Receptacle 
flat, naked. Corollas ligulate, truncate and 5-toothed at the apex. 
Anther-bases sagittate, with acute or shortly setaceo-acuminate auricles 
(rarely prolonged into lacerate tails) . Pappus copious ; hairs co-seriate, 
very slender, simple, persistent or separately deciduous. 
V 
Achenes ovoid, oblong or narrow, more or less compressed, sometimes 
flattened, shortly contracted at the base, abruptly or gradually produced 
into a beak at the apex ; faces 3 — 5-ribbed, the ribs slender or strong, 
