300 



Lxxxv. ASCLEPiADEiE (brown). [Xysmalohium. 



2. X. Holuhii. 



All species in which the coronal-lobes are very thick or laterally compressed, 

 with or without teeth or keels on their inner face, or, if dorsally flattened, are 

 still compar.'itively thick and entirely without keels or have only 1 rather stout 

 longitudinal median keel, but no filiform horn or tongue-like process on the inner 

 face, solid, never cucuUate complicate or cleft down the inner face, 1 refer to 

 Xysmalobixjm. 



Kanahia, which is also allied, and in coronal structure contains species referable 

 to both Xysmalohium and Aselepias, may be retained as distinct from botii by its 

 inflorescence. 



Corolla reflexed from the base, (and see 7, X. fra- 



ternum). 



Leaves narrowly linear, 3^-6 in. long, not reticu- 



lately veined beneath ; coronal-lobes very small, 



entirely adnate to the staminal-column. 



Coronal-lobes ovate, a minute tooth alternating 



with them 1. X. decipiens. 



Coronal-lobes linear or linear-oblong, no tooth 

 alternating with them ..... 



Jjcaves varying from linear to elongate-oblong or 

 oblong-lanceolate, not more than 3 in. long, re- 

 ticulately veined beneath ; coronal-lobes free, 

 ascending or radiating fiom the staminal- 

 column. 

 Midrib of leaves densely tomentose; corolla-lobes 

 4|^ lin. long ...... 



Midrib of leaves not tomentose; corolla-lobes 2-2A 



lin. long. 



Leaves ascending; coronal-lobes arising at the 



base of the staminal-column close to the 



corolla ....... 



Leaves widely spreading ; coronal-lobes arising 

 ^ lin. above the base of the staminal- 

 column 5. X. heudelotianum. 



Corolla not reflexed from the base ; lobes spreading or 

 ascending. 

 Leaves linear, §-2 lin. broad ; coronal-lobes minute . 

 Leaves ^2 in. broad, never exactly linear but 

 sometimes very long and narrow, and then 

 gradually tapering from base to apex. 

 *Leaves rounded, truncate or cordate at the base 

 and as broad or broader there than above. 

 Leaves elongated, gradually tapering from the 

 base to the apex. 

 Apex of the style produced beyond the anther- 

 appendages ...... 



Apex of the style not produced beyond the 



anther-appendages. 



Corolla bearded with woolly hairs on the 



margins and tips of the lobes inside. 



Corolla-lobes 4-5 lin. long; coronal- lobes 



scarcely reaching to the base of the 



anthers 



Corolla-lobes 2^-2| lin. long ; coronal- 

 lobes reaching much above the base 

 of the anthers .... 



13. X. sessile. 



4. X. reticulatum. 



3. X. gramineum. 



12. X. angolense. 



10. X dispar. 



11. X. barbigerum. 



