90 SYNOPSIS OF 



Erodium cicutarium, Lem. 

 Hab. Europe, Britain. Asia Minor. Barbary . 



OBS. This extremely polymorphous species is only seen on the 

 neutral-ground. The most common species in Gibraltar are 

 the E. moschatum and E. malachoides. Several varieties of 

 Pelargoniums are cultivated in the Alameda. 



, De C. 



Oxalis cernua, Thunb. 

 Hab. Cape of Good Hope. 



OBS. A double variety of this beautiful Oxalis is also met with 

 in Gibraltar. This plant being found so abundant near the 

 Alameda, and likewise near the signal-station, it has been sup- 

 posed by casual visitors to be a native of the rock ; but there is 

 no doubt that it is a Cape plant, introduced into Gibraltar 

 about twenty years ago (as Colonel Mitchell, R. A., informed 

 me that it was not found in Gibraltar before that time). It 

 appears also to have been introduced into Sardinia (Boiss.) and 

 Malta, and that it grows there almost as wild. The Oxalis 

 coraiculata is found in the Cork-wood, and unauthenticated spe- 

 cimens of it were shown to me as growing on the rock of 

 Gibraltar. 



ZYGOPHYLLE^E, R. Br. 



Tribulus terrestris, L. 



Vulgo Abrogos, Sp. Caltrops, E. 



Hab. Mediterranean regions of Europe. Asia Minor. 

 North of Africa. 



OBS. This plant is found in great abundance on the neutral- 

 ground, and is easily known by its fruit, which is composed of 

 five nuts, united in a subglobular whorl, armed with prickles, 

 resembling the machine called caltrops, formerly in use to ob- 

 struct an enemy's cavalry. 



