247 
Later, Mrs. L. A. Moore brought me a number of heads from 
the other side of Boulder, which proved to be as follows: 
(т) T. dubius; normal, but with 12 involucral bracts, going 10 
mm. beyond corollas. _ 
(2) T. porrifolius; normal, with 8 bracts. 
(3) T. porrifolius, variety. Flowers pale lilac; 8 involucral 
bracts. Two specimens, in one the bracts going 5 mm. 
beyond flowers, in the other only as far as ends of corollas. 
(4) T. porrifolius, variety. Flowers pale lilac as in 3, but rays 
very short, the total length of corollas of outer florets 
about 23 mm. The bracts, 10 in number, go about 
17 mm. beyond corollas. 
Are numbers 3 and 4 Ез hybrids from dubius X porrifolius ? 
I cannot now find any typical T. pratensis in Boulder. 
REVIEWS 
Halls' Yosemite Flora* 
Among the large number of books on out-of-door life we have 
seen none as attractive or as serviceable in make up as Professor 
and Mrs. Hall's *Yosemite Flora." The pigskin cover, the 
natural colored paper and the pocket size make it an almost 
irresistible companion to one interested in the wonderful flora 
display of Yosemite. Indeed the authors and their publishers 
have set a new standard which writers of popular books on natural 
history may well emulate. 
Nor is the pleasing appearance the only virture of the new 
flora. А casual thumbing of the pages discloses several half-tone 
plates illustrating some of the floral attractions of the park and 
many well-drawn text figures that greatly enhance its value. 
An introductory chapter discusses in a very readable style the 
general floral features and life zones of the region. Another ` 
chapter gives clear concise directions to the novice in the use 
of the keys and explanations of the botanical terms. 
dis the preface we learn that nine hundred and forty-five 
ey Monroe, and Carlotta Case. A Yosemite Flora. Pp. vii +282. 
ш Е1дег & ug fes San Francisco. 1912. $2.00 
