230 BOTANICAL GAZETTE, [ September, 
Our species are all clearly endemic with one exception, L. Lewisii. The 
European forms of L. perenne are heterogone-dimorphic and self-sterile, 
while the American representative is not heterogone. “ It appears, there- 
fore, that forms of a single species, originally distributed over the north- 
ern portion of both continents, have in the course of time differentiated 
so far as to acquire heterogeny in the Old World, or lose it in the New— 
the latter appearing more probable.” 
Contributions to American Botany, xtv. By Sereno Watson. From Proc. 
Am. Acad., xxii., pp. 396-481. 
Most of this contribution is given to the enumeration of plants col- 
lected by Dr. E. Palmer in Mexico in 1886. It contains the usual per- 
centage of new species that always rewards the labors of the diligent 
collector in Mexico. This collection was made about Guadalajara, state 
of Jalisco, as a center, and of all the localities, Tequila, a deep volcanic 
depression twenty miles northwest of Guadalajara, yielded the most nov- 
elties. Of the 675 species enumerated 120 are new, 40 new Polypetale 
by Watson, 45 Gamopetale by Gray, 30 Apetalze and Monocotyledons by 
Watson, 2 Grasses by Vasey, and 8 Ferns by Eaton. A new genus of 
mountains. In recasting this genus Mr. Watson has found it necessay 
to propose 6 new species of Arabis, all belonging to the section Turritis, 
and all western. Podistera is proposed as a new genus of Umbellifere, 
nearly related to Pimpinella, its type being Cymopterus (?) Nevadensis- 
Peucedanum graveolens of Bot. Kinz’s Exp. becomes P. Kingii, owing to 
prior publication of the former name in the Genera Plantarum. It 18 
also Seseli Nuttallii Gray, in large part. Quercus Sadleriana R. Brow! 
finds a Place among the western orks, and Q. Breweri Eng. is replaced by 
the earlier name of Q. (Erstedtiana R. Brown. 
Fresh-water Algz of the Uni : ae 
lmenal i Domida of the Uaited. Staten”, By. ev, Banc 
ae. Bethlehem, 1887. Roy. 8°. 2 vol., pp. 364, 151 plates. 
No ene) tare = been long expected, and meets with a warm here 
Giana the American flora is so much in need of careful system® 
was sides * i alge. The work of Dr. Wood, long since out of prin 
work net “ —— and confessedly incomplete, but has been the only 
se ve —— as a manual up to the present time. we 
some te exellent volume on the “Dasmids of the United States 1° 
‘me ago by the same author, has led to the expectation of an 
equally memeeey treatment of the remaining non-siliceous fresh-water 
