PHANEROGAMS — PROFESSOR BAYLEY BALFOUR. 251 



Order LX. ILLECEBRACE^. 



A small order the genera of which are spread, especially in dry and warm 

 regions, over the whole world. Two species are found in Socotra, and each is 

 the type of a new genus. 



1. HAYA. 



Haija, Balf. fil. in Proc. Eoy. Soc. Eclin. xiii. (1883). 



Flores bermaphroditi, parvi, ad nodos glomerati, bracteis scariosis stipuliformibus involucrati. 

 Periauthium 5-partitum, album ; seginenta aequalia, oblonga, obtusa, mutica, erosa v. 

 emarginata, tenuia, enervia, basi subcrassa. Stamina 5, basi segmentorum inserta, stamin- 

 odiis minutissimis alteruantia, filamentis subulatis ; antherse biloculares. Ovarium parvum, 

 trigonum, membranaceum ; stylus filiformis, elongatus, stigmate capitellato ; ovulum 

 solitarium, basilare, erectum, anatropum, funiculo longo tereti. Fructus tenuis, basim versus 

 in valvas tres debiscens. Semen erectum, ellipsoideum, testa Crustacea ; embryo dorsalis, 

 albumine farinaceo applicitus, leviter curvatus, radicula infera. — Herba annua, diffuse 

 divaricatim ramosa, glabra. Folia sessilia, 3-verticillata, obovata, apiculata, integerrima ; 

 stipulae minutre, ovatse, acuminata^, scariosse. Flores sessiles, in dicbasia brevia secunda 

 oppositifolia et axillaria conferti ; bractere parvse, fusco-brunneae, scariosae. 



A monotypic endemic genus belonging to the tribe Pollicltiece. Its nearest 

 ally is the monotypic IUecebrum, distributed in west Europe and northern 

 Africa. But from that genus the whole character of our plant separates it, its 

 inflorescence, perianth, and three-valved fruit being the more prominent 

 diagnostic features. 



Etym. I have named this genus after George Hay, M.D., Port Surgeon at 

 Aden, to whom I am indebted for much kindness and assistance in carrying 

 out the objects of our expedition, and who, an accomplished naturalist, has done 

 much to advance our knowledge of the flora and fauna of Aden and the 

 adjacent country. 



H. obovata, Balf. fil. loc. cit. Tab. LXXXIII. 



Herbacea vix pedalis a collo multiramosa ramulorum internodiis elongatis rectis tenuibus. Folia 

 |— 1 poll, longa ^— \ poll, lata ad nodum quemque 2 lateralia majora 1 minus inflorescentiae 

 oppositum obovata v. subspatbulata. Stipnlm ^ poll, longae. Inflorescentia § poll. diam. 

 ramulis brevissimis ; bracteas fiorales 8-10 £ poll, longi. Perianthii segmenta ^ poll, 

 longa. Stamina periantbiis breviora. Stylus ovario multo longior. Fructus minutus 5 4 

 poll, longus. 



Socotra. Not uncommon on the hill slopes. B.C.S. n. 250. Schweinf. 



n. 554. 



Distrib. Endemic. 



2. LOCHIA. 



Lochia, Balf. fil. in Proc. Eoy. Soc. Edin. xiii. (1883). 



Flores cunsimiles, bracteis scariosis non-involucratis. Pcriantliium berbaceum, demum 

 induratum, 5-lobum, tubo brevissimo obconico angulato,fauce disco tenui annulari instructa 



