290 
PHARMACOGNOSY. 
and unicellular glandular head, a stalk of a single 
row of four cells and a one-celled glandular head, or a 
stalk of double row of five cells and a two-celled glandu- 
lar head ; pappus a multicellular axis with unicellular 
branches. 
64. Calendula. — Bright yellow ; characteristic tissue 
of petals containing oily drops; few pollen grains; 
colored brownish with sulphuric acid. 
65. Crocus. — Orange-red ; glycerin mount colored 
deep orange ; few, nearly smooth, nearly spherical 
pollen grains (85-100 /x) ; papillae of stigma ; coloring 
principle soluble in water and not in fatty oils, being 
the reverse in capsicum ; with sulphuric acid fragments 
become blue immediately. 
66. Chirata. — Dark yellow ; ducts spiral, scalariform 
or with simple pores ; sclerenchymatous fibers long, 
narrow, thick-walled, more or less lignified, and with 
oblique pores; parenchymatous cells of pith large, 
slightly lignified, and with numerous simple pores; 
pollen grains oblong or ellipsoidal, very prickly, about 
35 n in diameter; collenchymatous cells with yellow- 
ish-brown resin and tannin masses. 
2. POLLEN GRAINS WANTING 
* FIBROVASCULAR TISSUE PRESENT. 
67. Lappa. — Lightyellow; parenchymatous cells with 
irregular crystalloidal masses of inulin; ducts few, 
reticulate, sometimes associated with few narrow 
sclerenchymatous fibers. 
68. Senega. — Dark yellow ; odor penetrating ; slightly 
sternutatory; sclerenchymatous fibers thick - walled, 
non-lignified, with oblique simple pores ; ducts short, 
lignified, with simple and bordered pores ; medullary- 
ray cells somewhat lignified, with large simple pores. 
Quillaja is distinguished from senega by having large 
