258 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
propriis circa 1.4 cm. longis et rhachidibus foliorum 4—5 cm. longis 
aculeis minoribus recurvatis armatis; pinnis 5-jugis 3-4 cm, longis 
in rhachillis aculeis minimis armatis; foliolis 9—11-jugis oblongis 
vel obovato-oblongis obtusis acute mucronulatis utrinque obscure 
adpresse puberulis uninervatis integerrimis circa 7 mm. longis, 
stipulis subulato-filiformibus integris; capitulis numerosis globosis 
in panicula pyramidata racemosa dispositis circa 6 mm. diametro 
(staminibus patentibus exclusis), ramulis pedicellisque inflores- 
centiae adpresse puberulis; floribus albis glabris, calyce 0.7 mm. 
longo leviter denticulato, corolla 3 mm. longa ad mediam 5-den- 
tata, dentibus ovatis subacuminatis; staminibus 7-8; ovario sub- 
sessile margine hispido-piloso, fructu ignoto.—M. sepiaria, Micheli, 
Leguminosae Langlasseanae, 279, not Benth. — Mexico: in clayey 
soil at La Correa, Guerrero, alt. 50 m., 4 October, 1898, Z. 
Langlassé, no. 415 (type in hb. Gr.). 
M. sepiaria, Benth., a Brazilian species, is widely different. It 
has few scattered strong spines and very numerous linear leaflets: 
(20 to 40 pairs on each pinna). 
M. colimensis, spec. nov. Verisimiliter suffrutescens, caule 
obtuse angulato glabro armato, aculeis brevibus crassiusculis peracu- 
tis valde compressis ; foliis 2 dm. longis (petiolo incluso), pinnis 15— 
18-jugis 4-5 cm. longis foliolis 27-82-jugis lineari-oblongis acutis _ 
4 mm. longis 1 mm. latis basi valde obliquis subtus sparse puberulis 
nervo medio eccentrico, stipulis subulato-filiformibus 1-1.5 mm. 
longis erectis vix induratis, stipellis subulatis 11.5 mm. longis, 
rhachide principali 1.5 dm. longo supra puberulo subtus aculeis par- 
vis recurvatis munito, rhachidibus secundariis inarmatis; inflores- 
centia magna pyramidali racemoso-paniculata infra folioso-bracteata, 
pedicellis fasciculatis filiformibus 1-1.8 em. longis puberulis; floribus 
eapitatis glabris, capitulis primum ovalibus deinde subglobosis, 
calyce perbrevi subtruncato cuspidato-denticulato; corolla 2 mm. 
longa glabra tenui dentibus acutiusculis ; fructu ignoto.— Mexico : 
Colima, Dr. Edward Palmer, 1897, no. 128 (type specimens in hb. 
Gr. and hb. U. S. nat. mus.). 
This species differs from M. eurycarpa and M. eurycarpoides, 
Robinson, in its more numerous pinnae, armed rhachises, and to 
some extent in the oval form of the young heads, which in the 
species just mentioned are essentially spherical, 
M. rurycarroweEs, Robinson, Proc. Am. acad., xxxvi, 472 
