260 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
the leaflets to a single slightly enlarged pair gives a rather distinct 
habit, but the examination of a series of specimens of the rather 
variable 31. laxiflora, Benth., leads to the conclusion that this plant 
is only an extreme variation of that species. 
M. polyanthoides, spec. nov. Fruticosa 3-5 m. alta, ramis 
striatis griseo-brunneis aculeis magnis compressis recurvatis atroru- 
bentibus subaxillaribus munitis; foliis 1.5 dm. longis, pinnis 4—7-jugis 
3-4 cm. longis basi geniculatis stipellatis, rhachide rhachillisque 
angulatis sparsissime pubescentibus, foliolis 13-17-jugis oblongis 
glabris 8 mm. longis 3-4 mm. latis apice rotundatis mucronatis basi 
obliquis supra viridibus subtus vix pallidioribus; floribus spicatis 
ignotis, spicis 2-3 cm. longis breviter pedunculatis, pedunculo puber- 
ulo rhachide florifero glabrato; legumine compressissimo 5-6 cm. 
longo 10-13 mm. lato irregulariter crenato apice abrupte acuminato 
stylo tenui saepe falcato breviter rostrato basi longe cuneato-atten- 
uato, stipiti circa 1 cm. longa, replo valvisque setoso-hispidis, semini- 
bus 8.—Mexico : on mountains above Iguala, Guerrero, alt. 1230 m., 
5 October, 1900, C. G. Pringle , no. 8408 (type in lib. Gr.). 
Distributed as 31. polyantha , Benth., but readily distinguished 
from that species by its more numerous pinnae and leaflets and 
especially by its long-stiped and somewhat larger fruit. From 31. 
stipitata it differs in the larger leaflets and broader hispid, not 
glabrous pods. 
M. rhododactyla, spec. nov. Frutex ramoso 3 m. alto, ramis 
griseis flexuosis in specimine viso inarmatis, ramulis flavescenti- 
tomentellis; stipulis parvis subulatis, petiolis propriis 12-16 mm. 
longis et rhachidibus foliorum circa 4 cm. longis inarmatis tomentellis, 
foliis bipinnatis, pinnis circa 9-jugis 2 cm. longis, foliolis 9-14-jugis 
anguste oblongis baud imbricatis apice rotundatis basi obliquis supra 
glaberrimis subtus adpresse pubescentibus arete sessilibus 3 mm. 
longis, floribus pallide roseis dense spicatis, spicis cylindricis 4 cm. 
longis longe pedicellatis binis vel trinis orientibus in racemis longis 
terminalibus dispositis; calyce brevi extus sericeo-pubescenti, corolla 
1.6 mm. longa extus sericeo-pubescenti ad mediam in dentes 5 ovato- 
deltoideos acutiusculos secta; staminibus 10: fructu ismoto.— 31. 
puberula , Micheli, l. c., 279, not Benth. — Mexico: in tropical 
region at Las Higueritas near the boundary between Michoacan and 
Guerrero, on granitic soil, alt. 500 m., 11 July, 1898, E. Langlasst. 
Although 1 have never seen authentic material of 31. puberula , 
