FLORA OF ADEN . 
285 
Flowers sessile or subsessile, solitary or in clusters or racemes ; bracts 
0 ; bracteoles large, usually exceeding the calyx. Calyx 5-partite or 
5-fid ; segments subequal, narrow, acute. Corolla oblique ; tube ven- 
tricose; lobes subequal, rounded, twisted to the left in bud, spreading 
in flower. Stamens 4, didynamous ; filaments glabrous or sometimes 
hairy at the base ; anthers subequal, 2-celled, the cells oblong, muti- 
cous, glabrous ; pollen globose, reticulate or honeycombed. Ovarv 
2-celled; ovules 3 — 10 in each cell; style linear, hairy ; stigma with 
one oblong-linear branch, the other suppressed or nearly so. 
Capsule clavate, cylindric, seed-bearing upwards, solid at the base 
below. Seeds large, thin, discoid, margined, hygroscopically hairy;, 
retinacula large, strong, hooked. 
Species about 200. 
Distribution : — All warm regions. 
1. Ruellia patnla Jacq. Misc. Bot. II, 358 ; Ic. PI. Ra.i. I, 12, t. 
119 ; Lam. 111. t. 550 ; T. Anders, in Journ. Linn. Soc. VII, 24 et IX, 
460 ; Oliv. in Trans. Linn. Soc. XXIX, 127 ; Hook. FI. Brit. Ind. IV. 
412 ; Engl. HochgebirgsfL Trop. Afr. 388 ; Lindau in Engl. u. Prantl. 
Pflanzenf. IV, 3B, 310, fig. 124 E, F. 
Ruellia pilosa T. Anders, in Journ. Linn. Soc. VII, 25 (partly). 
Ruellia Huttonii T. Anders, in Journ. Linn. Soc. VII, 25 (from 
descript.). 
Ruellia prostrata Lam. Encycl. VI, 349 (from descript.) ; Bedd 0 . 
Ic. PL Ind. Or. t. 282. 
Ruellia matutina Hochst. et Steud. ex Presl. Bot. Bemerk. 94. 
Ruellia erecta Roth Nov. Spec. 308. 
Dipteracanthus patulus Nees in Wall. PI. As. Rar. Ill, 82 et in DC,. 
Prodr. XI, 126; Wight Ic. PI. Ind. Or. t. 1505 ; Oersted* in 
Vidensk. Meddel. Kjo'b. (1854) 180, t. 4, fig. 19—21 ; Solms-Laub. in 
Schweinf. FL Aethiop. 109,. 243. 
Dipteracanthus matutinus Presl. Bot. Bemerk. 94. 
Petalidium patulum Dalz. and Gibs. FI. Bomb. p. 185. 
Arabic name : — Usara. 
Description : — A small usually pubescent suberect shrub ; stems 
long, straggling, much-branched, terete or subquadrangular; densely 
softly pubescent. Leaves ^ — \\ by £ — 1 inch, ovate or elliptic, obtuse, 
often apiculate, closely pubescent on both sides, base rounded or some- 
times shortly and abruptly narrowed ; petioles \ — § inch long. 
Flowers axillary, solitary or 2 — 3 together, nearly sessile ; bracteoles 
nearly | inch long (including a flat stalk T l g — inch long), foliaceous, 
elliptic, obtuse, densely pubescent and strongly ciliate. Calyx J inch 
