FLORA OF ADEN. 
259 
Fruit globose, almost 2-winged, pilose at first, finally glabrous ; 
nutlets 4, rugose. 
Flowers: — 'Dec. (Defl.). 
Locality : — Aden (Defl.) ; neighbourhood of Aden (Hunter). 
Distribution .-—Extends from the Cape Verde Islands through North 
Africa, Arabia, Socotra and Tropical Asia. 
8. Heliotropium paradoxum Vatke in Oester. Bot. Zeitschr. 
(1875) p. 167. 
Description : — A perennial, shrubby, much-branched plant up to \\ 
feet long ; branches stout, densely setulose. Leaves of sterile branches 
obovate-oblong, petiole-like attenuate at the base or sessile, ^ — 1 inch 
long and up to inch broad, slightly acute, entire ; of the flowering 
branches small, sessile, narrow, g- inch long and about -A- inch broad. 
Racemes few-flowered (8 — 5) ebracteate, dense. Flowers minute. Calyx 
as long as the corolla. Style-arms very unequal ; stigma conical, entire. 
Nutlets in pairs. 
Flowers and fruits : — June 1872 (Hildebrandt). 
Locality : — Shaikh O’thman, on the dunes (Hildebrandt). 
Distribution : — Hadramaut. 
Note : — Some botanists unite Heliotropium paradoxum with H . 
undulatum Vahl. It seems, however, that the reasons given by Vatke 
still justify H. paradoxum being considered as a distinct species : 
u Stirps abnormis H. lignoso (Schweinfurth) Vatke (Litkospermum 
1. ej.) proxima; praeterea vero etiam stigmate conico apice leviter et 
aequalifcer bilobo, id quod in ipsius Schweinfurthii exemplaribus optime 
videre contigit styloque terminali ; species haecce H. undulato Vahl 
simillima characteribusque proxima, sed differ! ut ex analysi optima 
Schweinfurthii et autopsia mea patet, styli ramis semper valde inaequali- 
bus. Id. paradoxum ob f rue tus struct uram Helioph) tis est adnumeran- 
dum, a quibus habitu abhorret ; nuculis geminatim concretis etiam ab H. 
lignoso differt, quod nuculas separabiles possidetA Vatke, 1. c. 
3. Arnebia Forsk. 
Annual or perennial erect or diffuse hispid herbs ; root often stain- 
ing red. Leaves alternate. 
Flowers dimorphic, yellow or violet, sessile or very shortly pedicellate, 
in simple racemes or spikes or slightly branched cymes ; bracts foliaceous. 
Calyx deeply 5-fid or 5-partite ; lobes lanceolate or linear, not or 
slightly enlarged in fruit. Coroll a- tube slender, straight, the throat naked 
