PHANEEOGAM^E — PROFESSOR BAYLEY BALFOUR. 305 



C. Aucheri, Jaub. et Spach. Now, whilst there maybe a question as to whether 

 it is possible to find good specific distinctions between the forms I have kept 

 here separate, there is no doubt that C. arenarius is quite a true species, having 

 rhizome of a different character, and it also differs in habit. C. Aucheri is also a 

 species which in many features is entirely distinct from C. conglomerates, Rottb. 

 From Socotra we have not the type, but a dwarfed form, which differs from 

 all hitherto described in its short narrow spikes, few flowers, and wide, closely- 

 set bracts. C. curmdus and C. arcuatus it most resembles. 



9. C. difformis, Linn. Sp. 67 ; Kunth Enum. ii. 38 ; Bcklr. in Linnsea 

 xxxv. 586 ; Boiss. Flor. Orient, v. 370 ; Rottb. Descr. et Ic. 24, t. ix. f. 2 ; Sibth. 

 Flor. Grajc. t. 46. 



Socotra. Near Tamarida. B.C.S. n. 171. 



Dtstrib. Widely distributed in tropical and subtropical regions. Not 

 common in Africa. 



10. C. (Papyrus) Tegetum, Roxb. Flor. Ind. i. 208. 



G. elongatus, Sieber in herb. Schimp. Abyss, sect. iii. n. 1994. 



C. longus, Hochst. in berb. Schimp. Abyss, sect. i. n. 57 ; Ach. Rich. Tent. Flor. Abyss, ii. 484. 



C. Schimperianus, Steud. Syn. ii. 34. 



Socotra. Near Galonsir. B.C.S. n. 284. 



Distrib. India and north-east tropical Africa. 



We have a fragmentary specimen which appears to be this species. 



11. C. (Papyrus) temiiflorus, Rottb. Descr. etlc. PL 30, t. xiv. f. l(non Jacq.). 

 Socotra. On the banks of the stream at Katheng. Schweinf n. 691. 

 Distrib. India, Mascarene Islands, and tropical Africa. Possibly merely a 



variety of C. rotundus, Linn. (Benth.). 



12. C. (Papyrus) rotundus* Linn. Sp. 67 ; Kunth Enum. ii. 58 ; Ach. 

 Rich. Tent. Flor. Abyss, ii. 482 ; Bcklr. in Linnsea xxxvi. 283 ; Boiss. Flor. 

 Orient, v. 376. 



C. hexastachyits, Rottb. Descr. efc. Ic. PI. 28. t. xiv. f. 2. 



Socotra. Near Galonsir. B.C.S. n. 31. Schweinf. n. 707. 



Distrib. Tropical and temperate regions of the whole world. 



A very variable species, to which, possibly, the last-mentioned species may be 

 referred as a variety. Very difficult to distinguish from C. longus, into which 

 it appears to pass. 



13. O. (Mariscus) umbellatus, Benth. Flor. Hongk. 386. 



Mariscus umhcllatvs, Vahl Enum. ii. 376 ; Kunth Enum. ii. 118. 



Kyllingia wmbettata, Eottb. Descr. et Ic. PI. 15, t. iv. f. 2 ; Beauv. Flor. d'Ow. et Ben. t. 55. 



var. cyperinus, Balf. fil. 



M. cyperinus, Vahl Enum ii. 377. 



TRANS. ROY. SOC. EDIN. VOL. XXXI. 2 Q 



