192 BOTANICAL GAZETTE [SEPTEMBER 
Fic. 7.—S. alatum: cross-section of root; C, cortex; End, endodermis; 
P, pericambium; three rays of hadrome and two strands of leptome are figured. 
X 320. 
PLATE XI 
Fic. 8,—S. anceps: cross-section of root; PH, protohadrome; PL, protolep- 
tome; the other letters as in fig. 7. 406. 
Fic. 9.—S. montanum: cross-section of root stele; letters as above. 496. 
Fic. 10.—S. xerophyllum: cross-section of root stele; letters as above. X496. 
Fic. 11.—S. xerophyllum: cross-section of root stele; V, vessels; the other 
letters as above; many of the pericambium cells are thick-walled. 496. 
Fic. 12.—S. angustifolium: epidermal projection from the foreleaf. 240. 
Fic. 13.—S. angustifolium: cross-section of the stoma from the leaf. 496. 
Fic. 14.—S. angustifolium: a stoma seen from above. X 499. . 
Fic. 15.—S. xerophyllum: cross-section of leaf; C, cuticle; Ep, epidermis. 
PLATE XIA 
Fic. 16.—S. montanum: cross-section of a thin lateral root; letters as above. 
096. 
Fic. 17.—S. californicum: chlorenchyma of leaf, seen from above. : 
Fic. 18.—S. californicum: cross-section of part of leaf; Ep, epidermis; 
PS, parenchyma sheath of mestome strand. 
Fic. 19.—S. montanum: chlorenchyma of leaf, seen from above. 240. 
Fic. 20.—S. montanum: cross-section of part of leaf; St, two stomata with 
their air chambers (A); the other letters as in fig. 18. X 320. 
IG. 21,—S, anceps: cross-section of part of leaf; Ep, epidermis; both 
leptome and hadrome have a support of stereome. 496. 
Fic. 22.—Iris cristata: chlorenchyma of leaf, seen from above. 240. 
