50 



ON SEEDLINGS 



sperm, colourless ; cotyledons oblong, obtuse, entire, many times 

 shorter and slightly broader than the radicle ; radicle cylindrical, 

 obtuse, slightly narrower in the middle or at the end next the coty- 

 ledons, with its tip close to the micropyle, but within the endo- 

 sperm. 



Seedling (fig. 420). 



Primary root slender, tapering, with a few fibrous lateral root- 

 lets. 



Hypocotyl tender, succulent, glabrous, or with a few short 

 papillose hairs, erect, terete, pale green, 2-5 cm. long, 1 mm. thick. 

 Cotyledons foliaceous, glabrous ; lamina oblong-ovate, obtuse, 

 subcuneate at the base, bright 

 green above, paler beneath, 1-5 

 cm. long, 8 mm. wide ; petiole 

 channelled above, connate around 

 the stem at the base. 



Stem erect, terete, glabrous, 

 green, succulent in the seedling 

 stage, ultimately woody ; 1st in- 

 ternode 2 mm. long, or hardly 

 developed, and several succeed- 

 ing ones similar. 



Leaves simple (ultimately 

 irnparipinnate), cauline, opposite, 

 stipulate ; petiole subterete, chan- 

 nelled above. 



First pair cordate, acute, 

 acutely serrate, with five to seven 

 ascending and incurved nerves, thinly pubescent in the young 

 state. 



Second pair similar. 



Third pair pinnately trifoliolate ; leaflets broadly ovate, acute, 

 acutely serrate ; terminal leaflet much the largest. 



Viburnum, L. 



EAKLY DEVELOPMENT OF FBUIT AND SEED (fig. 421). 



The position of the raphe in this genus is interesting and pecu- 

 liar. 



At the time of flowering or immediately after the corolla has 

 dropped, it passes (fig. 421, A) along one side of the ovule, across the 

 lower and apical end, and a little way up the other side to the 

 chalaza, which at this time is a little below the middle of the ovule. 



FIG. 420. Sambucus nigra. 

 Half nat. size. 



