PHANEROGAMS— PROFESSOE BAYLEY BALFOUR. 97 



LUDWIGIA. 



Ludvngia, Linn. Gen. n. 153 ; Benth. et Hook. Gen. PI. i. 788. 



A genus containing chiefly North American species, but a few are widely 

 spread in the old world. 



L. palustris, Ell. Bot. Car. Georg. i. 211 ; Boiss. Flor. Orient, ii. 752 ; 

 Syme Eng. Bot. t. 510. 



Socotra. Common. B.C.S. n. 346. Schweinf. n. 636. 

 Distrib. Europe, Cape of Good Hope, and North America. 



Order XXX. CUCURBITACE.E.* 



A large order, chiefly of tropical regions, of the whole world. All twiners 

 except our Socotran plant. There are representatives of six genera in Socotra. 

 One of these is endemic, one is tritypic with a species in Angola, one in central 

 Africa, and one in Socotra ; a third is a Mediterranean, south-west Asiatic, and 

 tropical African genus, whilst the three remaining are widely spread tropical 

 or sub-tropical genera. 



1. EUREIANDRA. 



Eureiandra, Hook. fil. in Benth. et Hook. Gen. PI. i. 825. 



A tritypic genus, one species being found in Angola, one in central Africa, 

 and the other in Socotra. 



E. Balfourii, Cogn. in Proc. Roy. Soc. Edin. xiii. (1883). Tab. XVII, B. 



Caule glabro ; petiolo brevissime sparseque puberulo demum glabro ; foliis utrinque breviter 

 sparseque aspersis demum albo-callosis plerumque leviter 3-5-lobatis, lobis ssepius triangul- 

 aribus apice subacutis ; floribus progenere parvis,masculis brevissime racemosis subfascic- 

 ulatis ; calycis tubo late infundibuliformi subcampanulato, staminum filamentis glabris ; 

 ovario oblongo ; fructu ovoideo-subfusiformi, apice longiuscule acuteque rostrato. 



Caulis gracilis angulato-sulcatus levis cinereus. Petiolus satis gracilis striatus levis vel 

 demum interdum leviter rugosus %-2\ poll, longus. Folia tenuiter membranacea ambitu 

 ovata supra lsete viridia subtus paulo pallidiora 3-6 poll, longa et fere totidem lata 

 rarius fere usque ad medium lobata, lobis margine undulato-crenulatis mucronulatisque, 

 mediano paulo longiore ad basim non constricto ; sinus basilaris subrectangularis |-1£ 

 poll, profundus latusque. Cirrhi graciles elongati teretes glabri. Pedunculus communis 

 masculus gracilis sulcatus leviter puberulus multiflorus £-l£ poll, longus ; pedicelli fili- 

 formes recti puberuli §-f poll, longi. Calycis tubus puberulus longitudinaliter tenuissime 

 nervosus superne satis dilatatus inferne longiuscule attenuatus £-£ poll longus et apice 

 totidem latus ; segmenta linearia \— f poll, longa ^ poll. lata. Corolla subglabra, 

 segmentis ovato-oblongis acutis 3-5-nerviis margine brevissime ciliatis | poll, longis. 

 Staminum Qlamenta ad basim non dilatata ^ Q -\ poll, longa ; antherse biloculares apice 



* I am indebted to M. Cogniaux for the determination of some of the difficult forms and 

 fragmentary specimens in our collection. 



TRANS. ROY. SOC. EDIN. VOL. XXXI. N 



