PHANEROGAMS — PROFESSOR BAYLEY BALFOUR. 173 



Three species occur in Socotra, but of only one have we specimens sufficient 

 for determination, and these show it to be endemic. 



1. B. SOCOtrana, Balf. fil. in Proc. Roy. Soc. Edin. xii. (1883), 79. 



Eamis tetraquetris marginibus angulato-sinuatis, lobis in spinas productis ; corolla atro- 

 sanguinea ; corona alte 5-fida ; segmentis apice trifidis, lobo medio minimo incurvo, lobis 

 lateralibus erectis subiilatis. 



Erecta multo breviterque ramosa glauco-cinerea superne rubescente-pannosa, ramis tetraquetris 

 marginibus angulato-sinuatis, angalis subcompressis lobatis, lobis spinis triangularibus 

 brevibus paulum deflexis terminatis. Flores mediocri pauci versus extremitates ramorum 

 dispositi pedicellati, pedicellis validis \ poll, longis. Calyx £ poll, longus, segmentis lanc- 

 eolatis basi incrassatis margine membranaceis intus 5-squamatis. Corolla expansa |- poll, 

 longa atro-sanguinea, lobis acutis -fa poll, longis. Corona gynostegio affixa alte 5-fida, 

 segmento singulo trilobato lobo medio minimo antherse incumbenti adpresso lobis 

 lateralibus subulatis erectis pilis deflexo-patentibus instructis. Pollinis massae breves late 

 ellipticse. Folliculi 4-5 poll, longi \ poll. diam. glabri glauci. Semina \ poll, longa late 

 marginata. 



Socotra. Common on the limestone plains, and on hill slopes at low 

 altitudes. B.C.S. n. 524. Schweinf. n. 740. 



Distrib. Endemic. 



A very distinct species, and remarkable in its corona, which is very deeply 

 divided into five lobes, each of which has three apical prolongations — the scales 

 of the inner and outer series. B. sinaica, Dene, and B. Aucheriana, Dene, (in 

 DC. Prod. viii. 649) are near allies, but from the descriptions — I have not 

 seen specimens — they appear to be different. 



We brought this plant alive to this country, and it thrives at Kew, Edin- 

 burgh, and Glasgow, and I hope it will ere long flower, when it may be figured. 



Boucerosia sp. 



Socotra. Limestone hills west from Tamarida and near Galonsir. 

 B.C.S. n. 585. Schweinf. n. 793. 



Another species, possibly endemic. It is a small form with close set 

 spines. As we have no flowers or fruit, it is not possible to match it. It is 

 not common on Socotra. Schweinfurth sends it from near Tamarida. We 

 found it on the hills near Galonsir. 



Unfortunately we have no living specimens of this plant. 



Boucerosia sp.? 



Socotra. On the plains ; occasional. B.C.S. n. 694. 



Another of the Stapeliece, probably a Boucerosia, but we have no flowers or 

 fruit. Specimens of this we brought alive to this country are now growing at 

 Kew, and its identity may therefore be ultimately determined from them. 



