190 



ON SEEDLINGS 



at the base in H. rosmarinifolium, and form a contrast to the 

 narrow leaves of the species. In germination the testa in 

 Cistus and Helianthenmrn splits widely to allow the exit of the 

 cotyledons. 



Cistus laurifolius, L, 



Fruit a one-celled, many-seeded, loculicidal capsule. 

 Seeds numerous, on the parietal placentas, polygonal, pale brown, 

 glabrous, on a long funicle ; hilum at the basal end ; raphe none ; 

 chalaza rather prominent and projecting into the interior of the seed. 

 Endosperm granular or subfarinaceous, extending from the base 

 up one side of the seed. 



Embryo spirally coiled, eccentric, pale yellow, very large for the 

 seed ; cotyledons linear, obtuse, entire, equal, the inner one being 

 much more coiled than the outer, situated 

 with their backs to the placenta, and their 

 edges towards the sides of the seed, plano- 

 convex, or semiterete ; radicle cylindrical, 

 obtuse, stout, somewhat shorter and nar- 

 rower than the cotyledons. 



Seedling (fig. 186). 



Hypocotyl erect, terete, glabrous, 13-18 

 mm. long. 



Cotyledons linear-lanceolate, obtuse or 

 subacute, entire, flat or convex above, and 

 subrevolute at the margins, dotted with 

 minute scales on both surfaces, otherwise 

 glabrous, deep green, opaque, with an indis- 

 tinct midrib, narrowed to the base and per- 

 foliate, forming a little cup round the plu- 

 mule, 6'5-8 mm. long, 1-75-2-25 mm. broad. 

 Stem erect, terete, stellately hairy, pale 

 green, ultimately shrubby; 1st internode 

 2-5-6'5 mm. long. 



First leaves simple, entire, cauline, 



opposite, decussate, exstipulate, petiolate, with a few hairs on both 

 surfaces, alternately and ascendingly penninerved ; petioles very 

 short, channelled above, perfoliate or connate at the base forming 

 a little cup. 



1st pair small, lanceolate, obtuse, entire, subtrinerved at the 

 base, otherwise alternately penninerved. 

 2nd pair similar. 



PIG. 186. Cistus lauri- 

 folius, x2. 



