420 igi. PRIMULACEAE - • I92. PLUMBAGINACEAE 



9. Stamens with an acuminate connective, inserted at the base of the corolla. 

 Corolla white, jabout as long as the calyx, bell-shaped, deeply cleft, 

 ciliate. Flowers solitary or 2 — 3 together in the axils of the leaves. 

 Leaves alternate, stalked, cordate, lobed. Stem creeping. — Species i. 

 Mountains of Central Africa. (Plate 122.) . . Ardisiandra Hook. 

 Stamens with an obtuse connective, inserted in the tube of the corolla. 

 Flowers terminal, solitary or in umbels or whorls. Leaves radical. 

 Stem erect, sometimes very short. .......... 10 



10. Corolla smaller than the calyx, bell-shaped, with a short tube, whitish or 

 reddish. Flowers in umbels. Leaves elliptical, subsessile. — Species i. 



North Africa. Used medicinally ' . Androsace L. 



Corolla larger than the calyx, salver-shaped, with a long tube. Leaves 

 spatulate. — Species 2. North Africa and Abyssinia. Used as orna- 

 mental or medicinal plants. " Primrose." . . . Primula L. 



FAMILY 192. PLUMBAGINACEAE 



Herbs, undershrubs, or shrubs. Leaves undivided. Flowers in spike- 

 head- or panicle-like inflorescences, regular or nearly so, 5-merous, herma- 

 phrodite, bracteolate. Calyx with valvate or open aestivation, usually folded. 

 Petals more or less clearly united, with contorted aestivation. Stamens as many 

 as the petals and opposite to them. Anthers turned inwards. Ovary superior, 

 i-celled. Ovule i, suspended from the basal lunicle, inverted, with superior 

 micropyle. Style or style-branches 5. Seeds with a straight embryo and 

 mealy albvimen. — Genera 7, species 90. (Plate 123.) 



1. Styles united high up. Stamens generally free from the corolla. In- 



florescence usually simple ; each flower with 2 bracteoles, which usually 

 bear no flowers in their axils. [Tribe PLUMBAGINEAE.] ... 2 

 Styles free or united at the base only. Stamens attached to the corolla. 

 Inflorescence composed of cymes ; each flower with i — 2 bracteoles, one 

 of which bears a flower in its a.Kil. [Tribe STATICEAE.] ... 4 



2. Sepals glandular, evidently united below. Corolla salver-shaped. Stamens 



free from the corolla. Undershrubs. — Species 9. Some of them yield 

 arrow-poison, tanning materials, or medicaments, or serve as ornamental 



plants Plumbago L. 



Sepals without glands, free or nearly "so. Shrubs 3 



3. Stamens inserted in the middle of the corolla-tube. Corolla salver-shaped, 



pink or violet. Inflorescence capitate. — Species 2. Abyssinia. 



Ceratostigma Bunge 



Stamens free from the corolla. Corolla funnel-shaped. Inflorescence 



spicate-paniculate. — Species. 3. Central and South Africa. {Vogelia 



Lam.) (Plate 123.) . Dyerophyton O. Ktze. 



4. Stamens inserted in the middle of the corolla-tube. Styles united nearly 



halfway up. Corolla blue, with a long tube. Undershrubs. — Species 3. 



North Africa. (Buhania Gir.) . . . . . Limoniastrum Moench 



Stamens inserted at the base 01 the corolla 5 



