URTICACILE 503 



and furnished with coarse, bulbous-rooted, stinging hairs projecting 

 at right angles from both surfaces of the leaf ; petiole semiterete, 

 shallowly channelled above, pubescent with rather fine, ascending or 

 subadpressed hairs, and frequently well provided with large stinging 

 hairs ; stipules intrapetiolar, erect, connate into one acute binerved 

 piece, pale-coloured or almost scarious. 



Nos. 1 and 2. Opposite, ovate, acute, trinerved, obtusely serrate- 

 dentate, the teeth tipped with a hair ; the strong lateral nerves 

 become incurved upwards, and run obliquely into the teeth, giving 

 off lateral branches into adjoining teeth. 



Xos. 3 and 4. Alternate, rotund-ovate, cordate at the base, more 

 deeply and coarsely serrate-dentate than the first two, with a similar 

 venation. 



Xos. 5 and 6. Deeply incised or lobulate with the lower lobes again 

 toothed. Venation as in those above. 



Grirardinia heterophylla, Dene. 



Hypocotyl erect, striated, 1-1-5 cm. long, glabrous, light green 

 or colourless. 



Cotyledons obovate or subrotund, obtuse, emarginate, sub- 

 fleshy, petiolate, glabrous, green, pinnatinerved like the leaves. 



Stem short, erect, quadrangular, hairy ; 1st iiiternode 3-5 mm. 

 long. 



First leaves simple, cauline, opposite, decussate, oblong, coarsely 

 serrate, subacute, hairy, and also covered with stings, green, pinnati- 

 nerved ; petioles short, channelled above ; stipules small, deciduous. 



Parietaria officinalis, L. 



Pistil syncarpous, superior ; ovary of two carpels, one-ovuled ; 

 ovule erect, orthotropous ; rnicropyle superior. 



Fruit an achene ; pericarp hard, crustaceous, shining ; seed 

 conforming in shape to the achene, oval, oblong or obovate ; testa 

 smooth, membranous ; hilum inconspicuous. 



Endosperm -comparatively copious, fleshy, surrounding the 

 embryo, greyish-white or almost colourless. 



Embryo straight, in the centre of the endosperm ; cotyledons 

 broadly oblong, or oval, obtuse, entire, plano-convex, lying with 

 their apices to the receptacle ; radicle terete, obtuse, about the 

 same length as the cotyledons. 



Forskohlea viridis, Ehrenb. 



Hypocotyl erect, terete, finely pubescent, 1-1-5 cm. long, light 

 green, faintly tinged with red. 



