PHANEROGAMS — PROFESSOR BAYLEY BALFOUR. 3 



the axillant leafy shoot is developed below the cladode. Usually two super- 

 posed leafy shoots arise and develope equally. The branching of the cladodes 

 is most irregular, as is the production of flowers. 



The internal anatomy of the plant is interesting, and conforms with the 

 characteristics of other Menisperms. I shall refer to this subject at greater 

 length in the appendix. 



Schweinfurth directs attention to the resemblance between this plant and 

 the South American Colletia cruciata, Hook. & Arn., a rhamnaceous plant not 

 unfamiliar in cultivation. The morphological likeness is very striking, and I 

 find the same succession of cladodes and leafy branches. Mr N. E. Brown of 

 Kew Herbarium points out that in the aphyllous section of the Australian 

 leguminous genus Daviesia similar features are found. 



Order II. PAPAVERACE^. 



A family of herbaceous plants of temperate and subtropical regions, con- 

 taining several species which are widely spread as weeds of cultivation. 



ARGEMONE. 



Argemone, Linn. Gen. n. 649; Beuth. et Hook. Gen. PL i. 52* 



An American genus of six species, one of which, the following, is found 

 almost everywhere in the tropics as an introduced weed. 



A. mexicana, Linn. Sp. 727 ; DC. Prod. i. 120 ; Oliv. Flor. Trop. Afr. 

 i. 54 ; Hook. fil. and Thorns, in Hook. Flor. Brit. Ind. i. 117 ; Bot. Mag. t. 243. 

 Nom. Vern. Maruna. (B.C.S.) 



Soeotra. In the vicinity of Tamarida. B.C.S. n. 454. 

 Distrib. Widely spread in the tropics. 



Order III. CRUCIFERiE. 



A very large order of herbs and rarely half-shrubby plants, most abundant in 

 the temperate and cold regions of the northern hemisphere • rare within the 

 tropics. Of the five genera represented in Soeotra, one is endemic, one has a 

 limited Persian and Somali Land distribution, a third is confined to the dry 

 plains of the old world tropics, the remaining two having a more extended 

 range in the old world. 



1. DICERATELLA. 



Diceratella, Boiss. Diagn. v. 80 (olim Diceratium, Boiss.) ; Benth. et Hook. Gen. PI. i. 71. 



A genus made up of three species of white and downy herbs, two of which 

 have a limited distribution on the desert plains of Persia, and the third is 



