108 



Lxxxiv. APOCYNACE^ (stapf). [Diphi'hytichus. 



within ; tube constricted near the base, obovoid above, 1 Hn. long ; lobes 

 slightly longer. 



Mozamb. Dist. German East Africa : Ugalla ; Kabombue, Bohm, 29a ! 

 Portuguese Ens': Africa : Lower Zambesi ; opposite Sena, Kirk / 



12. RAUWOLFIA, Linn.; Benth. et Hook, f . Gen. PI. ii. 697. 



Calyx small, eglandular within, more or less herbaceous; sepals 5, 

 almost free and imbricate or united into a flat r>-toothed cup. Corolla 

 salver-shaped ; tube slightly widened below the mouth, very rarely just 

 below the middle {R. Volkensii) ; mouth constricted, without appendages, 

 usually villous ; lobes 5, twisted and overlapping to the left. Stamens 

 in the widened part of the tube; filaments short; anthers free from 

 the stigma, ovate, usually rather obtuse, shortly and obtusely 2-lobed 

 at the base ; anther-cells polliniferous and dehiscing to the base. Disc 

 annular or cup-shaped, entire or slightly lobed. Carpels 2, free or 

 more or less coherent; style filiform or columnar; stigma capitate, 

 shortly cylindric, minutely papillose and slightly viscous, with a basal 

 deflected rim or membrane and a usually very short slightly bilobed 

 apiculus rising from a shallow depression ; ovules 2 in each cell, 

 collateral. Mericarps 2 (or often 1 by abortion), free or more or less 

 united, drupaceous; pyrenes crustaceous, 1-2-seeded, more or less com- 

 pressed. Seeds ovoid ; endosperm fleshy; cotyledons flat; radicle straight 

 or recurved. — Mostly glabrous trees or shrubs. Leaves opposite or 

 \erticillate, those of a whorl often very unequal ; axillary stipules ; 

 axillary glands numerous, in a dense fringe or in clusters, frequently 

 secreting resin. Inflorescences terminal or pseudo-axillary, peduncled, 

 few- or many-flowered, often repeatedly 2-:3-chotomous, compound, 

 umbeUiform or corymbose, rarely racemiform ; flowers small. 



Species about 50 in the tropics of both hemispheres and in eastern South Africa. 

 *Corolla-tube li-3| lin. long ; mouth densely villous; lobes \-\ the length of the 

 tube ; stamens near the mouth. 



fYoung branches stout ; leaf whorls crowded ; leaves firmly membranous or char- 

 taceous, ncute or acuminate, not caudate ; flowers sessile or shortly pedicelled, in 

 dense cymes on the ends of the secondary or tertiary rays of usually large umbels ; 

 fruit a globose or obcordate -globose twin drupe, or more usually (by abortion) a 

 simple often asymmetric drupe, rather fleshy, slightly compressed. 



Young branches distinctly 4- winged . . . . 1. R. macrophylla. 



Young branches terete or subangular, not winged. 

 Leaves narrow-lanceolate (|-lr, in. broad), long and 

 gradually acuminate at both ends; petioles 

 \-\\ in. long, very slender . . . . 2. S. caffra. 



Leaves lanceolate to lanceolate- elliptic (I5-4 in. 

 broad), acute or shortly acuminate. 

 Blade not or obscurely decurrent at the acute 



base ; petiole ^-1 in. long . . . 3. jB. Welwitschii. 



Blade more or less decurrent ; petiole usually 

 very short. 

 Blade about 5 times as long as broiid . . 4:. JR. natalensis. 



Blade about 2-4 times as long as broad. 



