CISTINE^E 19 1 



Cistus undulatus, Dunal. 



Hypocotyl 12-18 mm. long, finely pubescent, reddish. 



Cotyledons linear-lanceolate, acute, tapering at the base but 

 scarcely petiolate, entire, glabrous, light green, indistinctly one- 

 veined. 



Stem herbaceous, pubescent ; 1st internode 1-2 mm. long, light 

 green. 



First leaves entire, linear-lanceolate, acute, tapering to the base, 

 sessile, pubescent, light green, one-veined. 



Cistus ladaniferus, L. 



Hypocotyl glabrous, 5-8 mm. long, reddish. 

 Cotyledons linear, subacute, otherwise as in C, undulatus. 

 Stem as in C. undulatus. 



First leaves linear- oblong, shortly petiolate, slightly hairy, green, 

 distinctly one-veined. 



Cistus albidus, L. 



Hypocotyl finely pubescent, 5-10 mm. long, stained with 

 red. 



Cotyledons obtuse, glabrous with a few hairs towards the base, 

 dark green, otherwise as in C. undulatus. 



Stem as in C. undulatus. 



First leaves oblong, obtuse, tapering to 

 the base, ciliated, finely pubescent, dark 

 green, pinnatinerved. 



Helianthemum apenninum, DC. (fig. 

 187). 



Hypocotyl erect, terete, pubescent, 1'5- 

 2 cm. long, reddish immediately above the 

 ground, becoming light green near the 

 cotyledons. 



Cotyledons oblong or slightly obovate, 

 4-5 mm. long, petiolate, entire, obtuse, 



glabrous but with a few hairs on the petiole, dark green tinged with 

 red beneath ; midrib and two indistinct lateral veins running parallel 

 to the edges conspicuous in the basal half. 



Stem herbaceous, erect, terete, pubescent. 



First leaves simple, entire, cauline, opposite, stipulate, lance- 

 olate, obtuse, pubescent, light green, with a prominent midrib. 



