ONAGRARIE^E 



563 



Clarkia pulchella, Pursh (fig. 361). 



Primary root as in C. sp., p. 559. 



Hypocotyl erect, terete, or thicker under the cotyledons, and 

 tapering downwards, glabrous, 1-1-5 cm. long. 



Cotyledons two rarely three, ovate, obtuse, foliaceous, glabrous, 

 opaque green with a strong midrib, pale beneath ; lamina 14 mm. 

 long, 8 mm. wide ; petiole channelled above, semiterete, minutely 

 pubescent on the mid- 

 rib beneath and at the 

 margins above, about 

 4 mm. long. 



Stem as in C. sp. ; 

 1st internode 2- 5 mm. 

 long. 



Leaves cauline, op- 

 posite, decussate, gla- 

 brous or minutely pu- 

 bescent, especially on 

 the nerves, subfleshy, 

 opaque green, with a 

 stout midrib ; petioles 

 semiterete, minutely pu- 

 bescent, slightly chan- 

 nelled above. 



First pair oval -el- 

 liptic, obtuse, with two 

 very small lateral nerves 

 visible near the base. 



Second pair oval, obtuse, with two or four distinct lateral nerves 

 near the base, ultimately as they approach the full size narrowly 

 elliptic. 



Third to sixth pairs, ditto. 



When there are three cotyledons, the leaves are in whorls of 

 three, and there are axillary buds in the axils of both cotyledons 

 and leaves. 



DEVELOPMENT OF THE COTYLEDONS. 



Immediately after germination the cotyledons are oblong-oval, 

 entire with a slightly prominent colourless tooth at the apex of 

 the midrib, sessile and very shortly auricled at the base. 



Eleven days after germination they are broadly ovate, emar- 

 ginate with a tooth in the notch, almost rounded at the base and 

 very shortly petiolate. The innovation is distinguishable from the true 



o o 2 



PIG. 301. Clarkia pulchella, x 2. 



