318 



OX SEEDLINGS 



Pentstemon Mackayanus, KnowL et Westc. 

 Hypocotyl erect, terete, minutely pubescent, 4-6 mm. long, light 

 green or colourless. 



Cotyledons ovate-rotund, obtuse, entire or sometimes minutely 

 emarginate, petiolate, glabrous, dark green, with no apparent vena- 

 tion. 



Stem erect, terete, herbaceous, finely pubescent, light green ; 1st 

 internode 3-5 mm. long ; 2nd much shorter. 



First leaves simple, cauline, opposite, decussate, ovate, obtuse, 

 petiolate, exstipulate, with a few scattered hairs, trinerved with 

 indistinct upper lateral veinlets ; the first pair are entire ; the second 

 crenate. 



Collinsia bicolor, Benth. (fig. 559). 



Primary root long, tapering, with fibrous lateral rootlets, annual. 

 Hypocotyl erect, terete, minutely pubescent, green or reddish- 

 purple, 1'3-1'5 cm. long. 



Cotyledons rotund, or rotund-ovate, rounded at the base, 

 minutely emargmate at the apex, fleshy, glabrous except the 

 petioles, dull light green or stained with 

 red and dotted with white ; lamina 5-10 

 mm. long, and as wide, or slightly longer 

 than wide ; petioles semiterete, chan- 

 nelled above, minutely pubescent, dilated 

 towards the base and connate, 6'5-9'5 

 mm. long. Lamina obscurely and al- 

 ternately incurvinerved, and reticulate, 

 venation seen only when the cotyledon 

 is decaying. 



Stem herbaceous, annual, erect, 

 terete, minutely pubescent with deflexed 

 hairs, or subglabrous, pale green or 

 stained red ; 1st internode 7-13 mm. 

 long ; 2nd 4-13 mm. according to 

 strength of plant. 



Leaves simple, cauline, opposite, ex- 

 stipulate, petiolate, thinly hairy above, 

 subglabrous beneath, alternately and 

 ascendingly penuinerved, deep opaque 

 green above and dotted with white, much 

 paler, almost glaucous beneath and 

 shining ; petioles semiterete, channelled above, hairy, dilated 

 towards the base and subconnate. 



FIG. 559. Collinsia bicolor. 

 Nat. size. 



