284 DOGBANE FAMILY. 



of the proper tube or throat, alternate and conniving with as many 2-parted narrow 

 scales. Ovary one and 1-celled, with 2 parietal placentae, becoming a prickly pod. 

 Style slender. Seeds naked. 



2. NERIUM. Corolla salver-form or the long tube narrow funnel-form, the throat crowned 

 with 5 slender-toothed scales. Stamens on the middle of the tube ; anthers 2-tailed 

 at base and tapering at the apex into a long hairy, twisted, awn-like appendage. Style 

 1. Ovaries 2, forming pods. Seeds tufted. 



* * Herbs or scarcely woody plants, not twiners ; bark usually abounding with tough 

 fibers ; ovaries 2, becoming many-seeded pods in fruit. 



+- Leaves alternate, very numerous. 



8, AMSONIA. Corolla salver-shaped or the slender tube somewhat funnel-form, bearded 

 inside, without appendages at the throat, the lobes long and linear. Stamens inserted 

 on and included in the tube ; anthers blunt at both ends. Style 1, slender. Pods 

 long (4 '-6 ) and slender. Seeds cylindrical, abrupt at both ends, with no tuft. Up- 

 right herbs, with terminal panided cymes of bluish flowers. 



4. VTNCA. Corolla salver-shaped, or the tube funnel-form, the throat narrow and naked. 



Stamens inserted on the upper part or middle of the tube ; filaments short. Style 1, 

 slender. Pods rather short. Seeds abrupt at each end, naked, rough. The hardy 

 species trail or creep. 



5. APOCYNUM. Corolla bell-shaped, crowned with 5 triangular appendages in the throat. 



Stamens attached to the very base of the corolla. Style none. A large ovate stigma 

 unites the tips of the 2 ovaries, which in fruit form long and slender pods. Seeds 

 with a long tuft of silky down at one end. Upright or ascending herbs, with small 

 pale or white flowers in terminal cymes or corymbs, and very tough fibrous bark. 



* * * More or less woody-stemmed twiners, with opposite leaves. 



6. MANDEVILLA. Corolla funnel-form or salver-shaped, naked in the throat. Filaments 



very short Style 1. Ovaries 2, becoming 2 long terete pods. Seeds with a downy 

 tuft. Flowers large and showy. 



7. TBACHELOSPERMUM. Corolla funnel-form, nearly as in Mandevffla, but the flower 



small, and filaments slender. 



1. ALLAMANDA. (Named for Dr. F. Allemand, who discovered 

 the common species in Guiana.) Greenhouses, often half -climbing. 



* Corolla tube contracted below into a long stem-like base. 



A. cathartica, Linn. A showy shrub of the conservatory, with bright 

 green, oblong, thinnish and acute glabrous leaves on very short petioles 

 and in whorls of 4, and golden-yellow flowers 2.J'-3' long. Guiana. 



A. ndbilis, Moore. Flowers very large (4'-5' across) and rich, clear 

 yellow, the limb circular in outline; leaves in 3's or 4's, large and 

 abruptly acuminate, on very short petioles, hairy on both sides or at 

 least on the midrib beneath. Brazil. 



A. Hendersdni, Bull. Flowers large and pale yellow, with darker 

 veins; leaves large, elliptic-obovate, shining and glabrous, thick and 

 leathery, in 4's. Guiana. 



A. Schdttii, Pohl. Flowers large and yellow, the throat striped 

 with dark brown ; leaves oblong and glabrous, in 4's. Tall, suited to 

 roofs. Brazil. 



* * Corolla with a short club-shaped or bulb-like base. 



A. neriifdfia, Hook. Erect, glabrous shnib, with oblong or elliptic 

 sharply acuminate, nearly sessile leaves, in 3's-5's ; flowers rather small, 

 funnel-bell-shaped, golden-yellow, and streaked with orange. S. Amer. 



