POLEMONIACE^ 



243 



branching dichotomously, sparsely and minutely pubescent and sca- 

 brous, pale green suffused with red; 1st internode 6 mm. long; 2nd 

 1 cm. ; 3rd 9 mm. 



Leaves simple, digitately or 

 radiately tri- to multi-sect, caul- 

 ine, opposite, exstipulate, ses- 

 sile, deep green, subfleshy, 

 minutely ciliate at the margin, 

 otherwise glabrous. 



First pair tripartite with 

 acute segments ; lateral seg- 

 ments linear ; terminal one 

 much larger, oblanceolate. 



Second pair similar, but 

 much larger. 



Third pair five-sect ; ter- 

 minal segment oblanceolate ; 

 two lateral pairs slender, ob- 

 lanceolate-linear. 



Ultimate leaves seven- to 

 eleven-rayed ; segments linear ; 

 basal ones shortest and narrow- 

 est ; all ending in a common 

 subcuneate base. 



Polemonium caeruleum, L., 

 var. album. 



Primary root slender, taper- 

 ing, colourless, giving off a few 

 lateral rootlets. 



Hypocotyl very short, tapering into the root, greenish-white. 



Cotyledons petiolate ; lamina oblong-ovate, obtuse, 7 mm. long, 

 4 mm. wide ; petiole channelled above, 6 mm. long. 



Stem ultimately stout and short, with very shortly developed 

 internodes. 



Leaves compound, imparipinnate, radical (and ultimately cauline), 

 alternate, exstipulate, petiolate, glabrous, bright green above, paler 

 beneath ; petioles subterete, channelled above, dilated and subclasp- 

 ing at the very base. 



No. 1. Pinnately trifoliolate ; leaflets ovate ; terminal one 

 largest. 



No. 2. Pinnately five-foliolate, otherwise like the first ; pairs 

 of leaflets frequently unequal. 



B 2 



FIG. 528. Gilia lutea. Nat. size. 



