420 BOTANICAL GAZETTE [JUNE 
Chlorogalum pomeridianum. 
Fic. 8. Seedling: s, seed; c, cotyledon; /, leaf; 7; primary root; 7’, 
_ second root. 
Fig. 9. Half grown, descending specimen, in the latter part of January : 
6, bulb; 7, non-contractile roots ; 7, contractile root of the present year, with 
_ the wrinkles appearing at the base; 7%, dead, contractile root of the preced- 
ing year, pulled downwards by the movement of the bulb. 
1G. 10. Lower portion of adult bulb; longitudinal section: a, bulb axis; 
bs, bulb scales ; s¢, aerial stem of the present year; sf, remnants of the 
aerial stem of the preceding year; 7, living root of present year; 7%, dead 
root of preceding year. 
Fig. 11. Cross-section from the basal portion of a contractile root of a 
young, descending specimen, 5: cy/, central cylinder; z#, inner (active) 
cortex ; com, layer of compressed cells ; ox¢, outer (passive) cortex. 
Calochortus umbellatus. 
fe. 12. vite, ciara specimen, in April: 4, bulb; 7*, contractile 
root; &, husk of the last year. 
1 Almost full grown, etedting specimen, in April; the contrac- 
7 bulb ; 7, non-contractile roots ; 7%, contractile root ; 4, 
ars. 
| Brodiaca capitata. 
r ean ae in ‘March: ae newly eee aie ek ok 
wae of the same ; #7, new, | lateral tubers see 
ast year’s lateral tubers, shri 
ae husks of the same; , 
contact root, showing course of — strand x2. 2 
