FLORA OF ADEN. 
271 
Flowers axillary or in terminal racemes or spikes ; pedicels ebracteo- 
late. Calyx 5-partite ; segments imbricate. Corolla-tube spurred at the 
base in front ; upper lip erect, bilobed ; lower lip spreading, 3-lobed, 
produced at the base into a palate, closing the throat of the corolla, or 
more rarely depressed, leaving the throat open. Stamens 4, didynamous, 
ascending, included ; filaments filiform ; anther-cells distinct, oblong, 
parallel. Style filiform; stigma small, usually emarginate. Ovules 
many in each cell. 
Capsule ovoid or globose, dehiscing by a 3-valved pore at the apex of 
each cell, or by 4 — 10 valve-like teeth, or by circumscissile or valve-like 
opercula. Seeds ovoid, wingless, angular or rugose, or discoid and sur- 
rounded by a membranous wing. 
Species about 150. 
Distribution : — Nearly all in the northern extratropical regions of the 
old world. 
Flowers in terminal racemes . . . . . 1. L. macilenta. 
Flowers axillary . • • . . . . 2. L. sagittata. 
1. Linaria macilenta Dene, in Ann. Sc. Nat. ser. II, II, 252; DC. 
Prodr. X, 271. 
Description : — An undershrub, 1 foot high and more, slender, branch- 
ing ; branches elongate, rigid, erect, subspinescent, glabrous. Lower 
leaves 1 inch long, 2 — 2J lines broad, ovate to linear-lanceolate, acute, 
bidentate-sagittate at the base, attenuate into a thin short petiole, the 
uppermost leaves awl-shaped, entire. Bracts linear, subulate. 
Racemes terminal, loose ; pedicels capillary, L — 4 times as long as 
the calyx. Calyx 5-partite ; lobes linear, half as long as the corolla. 
Corolla (including the spur) 1 — 1^ lines long, sub ventricose ; upper lip 
bifid; lobes rotundate ; lower lip with rotundate lobes ; spur subattenu- 
ate, hamose when young, later on as long as the corolla. Scyle shorter 
than the corolla, glabrous. Ovary suboblique, subrotund, slightly 
puberulous at the apex. 
Capsule conical, slightly shorter than the calyx, glabrous. Seeds 
tubercled-echinate. 
Locality : — Crater and slopes of Shum Shum Range (Shweinf., 
Defl.) ; without locality (Birdw., Beevor). 
Distribution .—Yemen, Sinai, Eritrea. 
& Linaria sagittata Hook. f. Bot. Mag. t. 6060; This.-Dyer FI. 
trop. Afr. (1906) IY, sect. 2, 291. 
Linaria heterophylla Steud. Nom. ed. 1, 482; Spreng. Syst. II, 790; 
Benth. in DC. Prodr. X, 270 (not of Desf.). 
Linaria patula Baker in Kew Bull. (1895) 222. 
