174 
Jusst@a repens of Linneus. F.von Mueller (Erythea, i. 61, 62). 
Prof. Greene prints a letter from Baron von Mueller, calling 
attention to the fact that the true /usszea repens, L., occurs only in 
. India, and that the North American plant so-called is probably /. 
diffusa, Forsk. 
Lespedeza—The North American Species of. N. L. Britton. 
(Trans. N. Y. Acad. Sci. xii. 57-68; reprinted as Contrib. 
Herb. Col. Coll. No. 34.) 
Twelve species are recognized and concisely described. Notes 
are given on distribution and on type specimens. Two new 
varieties are proposed. 
Lichens of Lancaster County, Pennsylvania—Preliminary Enumer- | 
ation of the. A. A. Heller (pp. 4, Lancaster, 1893). 
A list of 78 species, with localities and habitats. 
Loco—Some Observations upon. Dr. Mayo (Bull. Kans. Agric. Exp. 
Sta. No. 35). 
The author concludes that the “Loco” disease is the result 
of malnutrition caused by the affected animals eating freely of 
Astragalus mollissimus, or Oxytropis Lamberti. The presence of. 
any narcotic principle in these plants is doubted. 
Mangrove-tree—The. (Garden and Forest, vi. 97). 
With two illustrations of Rhizophora Mangle, one showing the 
tree rising from a mass of underbrush, the other showing the 
lower part of the trunk and the roots. 
Mamillaria prismatica. (Bot. Mag. t. 7279). 
Native of Mexico. A species of the group Amhalonium. 
Metasperme of the Minnesota Valley. Conway MacMillan. (Rept- 
Geol. and Nat. Hist. Surv. Minn. Botanical Series, i. cloth, pp- 
826, two maps; Minneapolis, Minn., dated Dec. 29, 1892). 
In his preface the author expresses satisfaction at the action of 
the Botanical Club of the A. A. A.S., taken at the Rochester 
meeting of 1892, in its endeavor to establish nomenclature “ upon 
some other than a personal basis,’’ and states that the initial date, 
1753, would have been adopted by him, for genera as well as 
species, in this work, had not most of it been in type when the 
Club’s action was taken. In order to comply with the principle, 
