500 OX SEEDLINGS 



Cotyledons petiolate, pubescent ; lamina rotund, 2 mm. long, 

 thin, or almost membranous ; petiole 1'5 mm. long, slender. 



Stem erect, terete, herbaceous, pubescent and hairy, pale green, 

 about 2 mm. thick ; 1st internode 4 mm. long ; 2nd 9 mm. ; 3rd 

 1-1 cm. 



Leaves cauline, opposite, decussate, 

 exstipulate, petiolate, pubescent, and 

 coarsely hairy on the younger leaves ; 

 less hairy on older ones. 



First pair small, ovate, obtuse, 

 entire ; petiole slender, semiterete, 3- 

 4 mm. long. 



FIG. ^.-noc^lialus niveus - Second pair much larger ; rotund- 

 ovate, obtuse, palmately trinerved, 

 obsoletely and distantly serrate ; petiole semiterete, channelled 

 above, closely pubescent, and sparsely harry. 



Third pan- scarcely opposite, cordate-ovate, acute, coarsely 

 serrate ; nerves ascending and incurved ; serratures subtriangular. 



TJrtica dioica, L. (fig. 650). 



Pistil apocarpous, superior ; ovary of one carpel, one-celled, one- 

 ovuled ; ovule basal, erect, orthotropous ; micropyle superior. 



Fruit an achene, ovate, compressed, glabrous, included in the 

 somewhat accrescent perianth, tipped by the persistent base of the 

 style, subancipitous, straw-coloured ; pericarp subcrustaceous. 



Seed ovate, compressed, closely conforming to the interior of the 

 achene ; testa thin, membranous, closely applied to the interior of 

 the pericarp ; micropyle apical, and superior ; hilum and chalaza 

 basal, the latter dark-coloured and rather prominent, causing an 

 emargination in the endosperm and cotyledons. 



Endosperm forming a thin layer round the embryo, subfarina- 

 ceous, white. 



Embryo central, straight, large, nearly equalling the length and 

 breadth of the seed, colourless ; cotyledons rotund, obtuse or minutely 

 emarginate with a small rounded or obtuse tooth in the notch, sub- 

 truncate at the base ; radicle oblong, terete, obtuse, pointing to the 

 micropyle close to the apex of the seed, somewhat shorter than the 

 cotyledons. 



Seedling. 



Primary root slender, tapering, with fibrous lateral rootlets. 

 Hypocotyl succulent, terminating abruptly at the lower ex- 

 tremity, slightly pubescent, pale green, mottled with red, 1-1 cm. long. 



