1897 | CURRENT LITERATURE 445 
NOTES FOR STUDENTS. 
ITEMS of taxonomic interest are as follows: Illustrations of Hypericum 
galiotdes* and 1. lobocarpum™ have appeared in recent numbers of Garden 
and Forest. W.W.Ashe™ has prepared a synoptical presentation of the 
genus Asarum in eastern America, recognizing eight species, four of which 
are described as new. E. L. Greene’ has published a fascicle of new species 
of Trifolium, seventeen in number, also five new species of Streptanthus 
has segregated two new species from the Apocynum forms of the eastern 
United States, has described five new species of Eriogonum, has recognized 
. A.A. Heller’ substitutes the generic name Edwinia forthe well known 
Jamesia T. & G. (1840), since Rafinesque has used the latter name in 1832, 
an unfortunate change which he tries to moderate as much as possible by 
using the given name of Mr. James. E. Koehne” has published further 
studies of Lythraceze, among which are included many tropical American 
orms. C. V. Piper™ has described a new Rubus from the cafions of Wash- 
ington, naming it R. Hesfertus. Carl Purdy has described two new species 
of Lilium from California and Washington. J. K. Small* has described a 
new oak, Quercus geminata, from Florida, also two new species of Celtis, one 
from Georgia, C. Georgiana, the other from Texas, C. He//eri, and has pub- 
lished a revision of the species of Gaylussacia in the southern states, recog- 
nizing seven species.—J. M. C. 
ALBERT KATTEIN, after a study of the development of the vascular 
es of roots and stems, agrees with Van Tieghem and others that the 
central cylinder of the root is homologous with the bundle complex of the 
stem rather than with a single bundle, as held by Russow and DeBary. It 
follows that the pith of the central cylinder when present is homologous with 
that of the stem in dicotyledons.—C. R. B 
ONE OF THE most interesting papers that has recently appeared is a con- 
sideration by Stahl of the cause of nyctitropic and related movements. The 
author believes that the common view advanced by Darwin, that the move- 
ments are to prevent the radiation of heat, can scarcely be the chief cause. 
* Garden and Forest 10: 433. 1897. 3 Ibid. 453. 
me 1 contributions from my herbarium 1: 1-4. 1897. 
38 Pittonia 3: 199-230. 1897. 
** Bull. Tor. Bot. Club 24:477. 1897. *° Zid. 103-105. 
gc bot. Jahrb. 23: 17-36. 1897. — Torr. Bon. Club 24: 438-445. 1897, 
*Erythea §:103. 1893. +t Bot. Centralbl. 72:55. 1897. 
™ Ueber den Pflanzenschlaf und verwandte Erscheinungen. Bot. Zeit. 55*:71— 
‘199. = 
