LXXVI. ASCLEPIADE^. 325 



erect) of these pollen-masses slioulJ be carefully studied, and secondly that the configuration 

 of the corona be attended to, for whilst there is ^veat general resemblance in the mnjority of 

 species belonging to very difTerent genera, the genera themselves are better defined than 

 might have been expected from characters apparently so artificial. 



r 



^ 4 A I 4 



Tribe I. Periplocese. — PoIle7i-77iassfs (1, 2 or ^ to each ant/ie)-) fjramiJar^ evideniJif 

 consistDig of ^ orjnore agglomerated granules. Filaments more or less free (connate in 

 all the other tribes). 



Corolla-tube cylindrical; limb spreading. Corona of 5 scales, in- 

 serted in the tube behind the filaments 1. Gymnaniueka. 



Ieibe II. Secamoneae. — Pollen-masses smooth, 4 to each anther* 



Corolla rotate; lobes contorted-imbricate. Corona of 5 laterally- 

 compressed segments, vertically adnate to the gynostegium . . 2. Secamone. 



UiBK III. Euasclepiade3e.^P(?//-?;z-w^^^^* smooth, 2 to each anther^ pendulous. 

 Corolta-iobes imbricate in the bud, usually contorted {very slightly so in Gomphocarpus 



'^^^Asclepias). 



"oronaof 5 distinct hood-shaped segments attached to the corolla- 



tube, which is broad but distinct . * , *Arauja. 



Corona of 5 di&tinet saccate or inflated segments at the back of the 



anthers, with an exterior corona below them, consisting of 5 



protuberances or a sliditlv prominent riu^'. Corolla nearly 

 rotate. t: j i 



Outer corona very prominent. Plant with sncculent leafless 

 branches (in the Australian species) 3. Sarcostemma. 



<^iUer corona scarcely prominent. Leaves (in the Australian spe- 

 cies) linear 4. Pentatropis. 



orona of 5 distinct hood-shaped or concave segments, without any 

 external ring or protuberances. Stems erect. Corolla rotate. 



torona-segments without internal appendages *GomphocarpuS. 



Corona-segments each with an internal appendage *Asclepias. 



corona membranous, the segments either distinct but not saccate or 

 united in a lobed cup round the gynostegium. Corolla nearly 



.Corona of 5 segments, quite distinct in the Australian species . 5. ViNCETOXicuif. 

 Corona with 5 or 10 marginal lobes and 5 or 10 additional pro- 

 tuberances or lobes inside the margin .6. Cynanchuk. 



Tribe IV. l^l^LrBdQniQv^.— Pollen-masses smooth, 2 to each anther, horizontal or 

 ^^ct. Corolla-lobes contorled-iinbricate {very slightly so in some Tylophorte). 



foUen-masses small, globular, laterally attached. Corolla rotate, 

 corona of 5 segments, more or less fleshy ; adnate to the gyuo- 



stegmm and sometimes forming a ring round it 7. Tylophora. 



~7"''^^^ses oblong, erect. Corolla urceolate or rotate. Corona 

 ^0 segments usually fleshy or saccate and adnate at the base 



With a short erect free or adnate point 8. Marsdema. 



^iitn-rnasses erect. Corolla (small) with a short broad tube and 

 ^preadmg lobes. Corona none or of 5 scarcely prominent glands 

 at the base of the gynostegium 9- Gymnejia. 



^^?^. ^' Stapelie*. -Pa//^/2.;K^jj^^ smooth, 2 to each anther, erect. Corolla-lobes 

 ^^^ate {often induplicate), 



(T ^ *^^ate. Corona a scarcely conspicuous undulate ring. 



(Uaves linear or none) . . . . 1^- Mickostemma. 



Trl\ ^^?!^^^t*^- Corona o*f 5 linear 2-cleft segments. (Leaves 

 s^aE orbicular fleshy) H- Dischidia. 



