PHANEROGAMS— PROFESSOR BAYLEY BALFOUR. 85 



pods. From extreme forms exhibiting these differences, there appears to be a 

 complete series of transition stages to the type ; the most constant of all the 

 differences is the colour on the seed coat, which in true R. Memnonia is mottled, 

 in R. pulverulenta is monochrome. 



22. CASSIA. 



Cassia, Linn. Gen. n. 514 ; Beuth. et Hook. Gen. PI. i. 571. 



A large genus, widely dispersed in warm and tropical countries of both old 

 and new worlds, especially abundant in the latter. Of the five species in 

 Socotra, two are tropical cosmopolitan, one is common in the old world tropics, 

 and two are tropical African and south-west Asiatic and Indian. 



1. O. Sophera, Linn. Sp. 542; DC. Prod. ii. 492; Oliv. Flor. Trop. Afr. 

 ii. 274 ; Baker in Hook. Flor. Brit. Ind. ii. 262. 



C. chinensis, Jacq. Icon. Bot. t. 73. 



Socotra. Common about villages on the plains. B.C.S. n. 5. Schweinf. 

 n. 384. 



Distrib. Cosmopolitan in the tropics. Said to be indigenous only in Asia. 



Most of the Socotran plants have small leaves and fewer leaflets than usual. 

 Boissier says it is frequent in the vicinity of Mascate on the Arabian coast. 

 Schweinfurth notes "leguminibus teretibus ! " on his specimens. 



2. C. Tora, Linn. Sp. 538 ; DC. Prod. ii. 493 ; Oliv. Flor. Trop. Afr. ii. 275 ; 

 Baker in Hook. Flor. Brit. Ind. ii. 263. 



Socotra. In the vicinity of villages. B.C.S. n. 658. 

 Distrib. Cosmopolitan in the tropics. 



3. C. Obovata, Collad. Hist. Cass. 92, t. 15a ; DC. Prod. ii. 492 ; Oliv. 

 Flor. Trop. Afr. ii. 277 ; Boiss. Flor. Orient, ii. 631 ; Baker in Hook. Flor. Brit. 

 Ind. ii. 264. 



Socotra. Near Tamarida. Schweinf. n. 335. 



Distrib. Tropical Africa, and from Arabia eastwards to the Indian 

 peninsula. 



Schweinfurth, who has alone got this from Socotra, tickets it as " aff. C. 

 obovatse sed foliis carnosulis aliisque notis diversa," but it appears to be only 

 this species. 



4. C. holosericea, Fresen. in Flora 1839, 54 ; Oliv. Flor. Trop. Afr. ii. 

 278 ; Franch. Sert. Somal. in Miss. Bevoil 30. 



Senna ovalifolia, Batka Monog. Senn. 35, t. 4. 



