101 
gen., includes four of Dr. Gray’s species of Plagiothrys, and a 
new one, S. Harkunessiz. 
Biologia Centrali Americana.—Botany, Part xxiii—By W. B. 
Hemsley. 
This part was issued in March. The work is approaching | 
completion, the present pages containing supplemental matter in 
Composite and the following; an enumeration of a collection 
of plants made on Cozumel Island off the coast-of Yucatan, by 
F. Gaumer in 1885, in which several new species are described ; 
a list of plants from several islands off the coasts of Yucatan and 
Honduras made by Mr. Gaumer in 1886, and a list of Costa 
Rica ferns. The appendix contains a valuable sketch of the 
history of the botanical exploration of Mexico and Central 
America. 
Botanical Contributions, 1887.—Asa Gray. (Proc. Amer. Acad. 
Arts and Sci., xxii., pp. 270-314.) 
I.—A Revision of some Polypetalous Genera and Orders. 
Under Papaveracee Dr. Gray offers an arrangement of Zsch- 
' scholtzia, recognizing nine species and one variety. In Portula- 
caceé nine genera are adopted, it being contended that Spraguca 
and Calypiridium are distinct, in opposition to the views of Pro- 
fessor Greene. Of Portulaca, Dr. Gray adopts four terete-leaved 
species, P. parvula here first described. Calandrinia sesuvibides, 
n. sp., is the Claytonia ambigua, Watson. A rearrangement of 
Claytonia is given in which C. cordifolia and C. Nevadensis of 
Watson are included in C. asarifolia, Bongard; C. Sibirica, L.., 
var. heterophylla, n. var., is the C. alsinotdes, var. heterophylla, 
T. & G, and C. bulbifera, Gray, is reduced to var. bulbillifera, 
n. var., of the same species; C. spathulata, Dougl., var. tenuifolia, 
n. var., is C. tenutfolia and C. exigua, T. & G.; C. Halli, n. sp., 
is the C. Chamissonis, var. tenerrima, Gray. Spraguea, Torr., 
is regarded as of but a single species. Calyptridium Parryi is a_ 
new species from Bear Valley, California. In Malvacee we find 
critical revisions of all our larger genera, Sidalcea pedata, 
Spheralcea Coulteri, (the Malvastrum Coulteri of Watson), S. 
ambigia, (the S. Emoryi, Torr. in part), S. Rusbyi, Sida Neo- 
Mexicana and S. Xanti, Anoda Arizonica, A. Thurberi, A. abuti- 
loides and Abutilon Xanti are new species. AHorsfordia is a new 
