ROBINSON AND BARTLETT. — PLANTS FROM GUATEMALA AND MEXICO. 53 
this species somewhat resembles A. americana L., A. hispida Willd., 
and A. sensitiva Sw. It has, however, flowers which are much larger 
than those of A. sensitiva, and somewhat larger than those of the other 
species mentioned. It differs furthermore from A. Aispida in its entire 
not dentate bracts, and from both A. americana and A. hispida in its 
essentially glabrous foliage and fruit. “ 
Cassta EMARGINATA L., var. subunijuga Robinson & Bartlett, 
n. var., foliolis saepissime 2 late oblongo-ellipticis 6-7 cm. longis 4-5 
cm. latis supra molliter pubescentibus subtus flavido-tomentosis. — 
Gualan, Department of Zacapa, Guatemala, 15 January, 1905, C. C. 
Deam, no, 220 (type, in hb. Gray). This variety appears to agree in 
flowers and fruit with the typical form, but it is noteworthy in habit 
by reason of the striking reduction in the number of leaflets to two. 
Occasionally, however, leaves with four leaflets occur on individuals on 
which most of the leaves have but two leaflets; so there is reason to 
suppose that the plant is merely a varietal development from a form 
with more numerous leaflets, rather than a separate species. 
Mimosa (Habbasia) gualanensis Robinson & Bartlett, n. sp., 
ser. Leptostachyarum, caulibus gracilibus lignosis 4 m. longis aculeatis 
tomentellis, aculeis sparsis parvis valde recurvatis compressis inaequal- 
ibus maximis vix 2 mm. longis brunneis; foliis majusculis 27 em. latis ; 
pinnis 3-jugis 9-14 em. longis; foliolis obovato-oblongis 2-4-jugis 4-5 
cm. longis 2.4~3 em. latis firmiusculis supra reticulatis utrinque glabris, 
petiolo 7 cm. vel ultra longo rhachique valde armatis aculeis sparsis 
numerosis recurvatis 0.7-2 mm. longis; rhacheolis etiam basin versus 
aculeolatis ; spicis gracilibus 5 cm. longis densifloris breviter peduncu- 
latis, pedunculis tomentellis ; floribus 2 mm. longis; calyce 1.2 mm. 
longo campanulato brevissime 5-dentato extus tomentello; petalis 5 
calyce subduplo longioribus oblanceolato-oblongis ; staminibus 10 ma- 
turitate modice exsertis; legumine immaturo 10 cm. longo 1.3 em. 
lato 15-seminato plano tenui glabriusculo leviter arcuato, stipite cras- 
siusculo tomentello tereti 5-6 mm. longo. — Gualan, Department of 
Zacapa, Guatemala, 19 January, 1905, C. C. Deam, no. 224 (type, in 
hb. Gray). This species, although clearly of the Leptostachyae, does 
not appear to be very closely related to any other. It should probably 
be placed near M. guatemalensis Benth., and MM. spirocarpa Rose. 
Tetrapteris emarginata Bartlett, n. sp., fruticosa procumbens 
3-5 m. longa; ramis oppositis glabris griseo-brunneis ; ramulis viridi- 
bus nigro-punctatis ; foliis oppositis, aetate utrinque glabris, juventate 
albo-sericeis pilis mox deciduis, forma valde variabilibus, in ramulo 
florifero sessilibus vel perbreviter petiolatis suborbiculatis 1-1.5 cm. 
diametro cordatis emarginatis saepe mucronulatis, in ramulo foliifero 
