730 BOTANY AND PHARMACOGNOSY. 



epidermal cells of stem and corolla with distinct striae; the sto- 

 mata broadly elliptical and with very small openings. In Scutel- 

 laria canescens the non-glandular hairs are 3- to 5-celled and vary 

 in length from 0.3 to i mm. ; the glandular hairs have a 4-celled 

 stalk and 8-celled head, are larger and more prominent than in 

 6". lateriflora; and the opening between the guard cells is on sur- 

 face view long and narrow. 



38. SALVIA. — Dark green; non-glandular hairs i- to 6- 

 celled, filled with air (Fig. 284, F) glandular hairs numerous, of 

 two kinds, stalks i- to 3-celled, glandular heads unicellular or 

 8-celled (Fig. 285, £). 



b. GLANDULAR HAIRS WANTING. 



a With Non-glandular Hairs. 



39. LOBELIA. — Dark green; non-glandular hairs, i-celled, 

 0.3 to 0.6 mm. long, walls moderately thick, with numerous 

 slight centrifugal projections; pollen grains ellipsoidal, smooth, 

 15 to 30 /i in diameter; laticiferous vessels branched; tracheae 

 spiral, or with scalariform and bordered pores ; sclerenchymatous 

 fibers comparatively thin-walled, non-lignified, and with simple 

 oblique pores. Seeds about 100 /t long, reddish-brown, reticulate. 



40. MATICO. — Grayish-green; non-glandular hairs numer- 

 ous I- to 6-celled, varying from 0.2 to i mm. in length, with 

 walls 2 to 4 /u thick and striate, the apical cell being sharply 

 pointed ; numerous globular, yellowish or reddish resin masses 

 in oil glands of leaf : fragments of perianth with fan-shaped upper 

 portion, composed of numerous long, non-glandular hairs, which 

 are much collapsed and deeply striate ; seeds reddish-brown and 

 distinctly reticulate, somewhat resembling those of Lobelia. 



41. TANACETUM. — Yellowish-green; non-glandular hairs 

 few, 4- to 5-celled, about 150 ;«. long, the individual cells being 

 somewhat oblong and with yellowish-brown contents ; glandular 

 hairs on akenes with short stalk and large, ellipsoidal head ; involu- 

 cral bracts with a row of transparent marginal cells an.d central 

 portion with narrow, thick-walled, libriform cells with numerous 

 simple pores ; pollen grains spherical or somewhat triangular, 

 thick-walled and with numerous spinose, centrifugal projections ; 



