ROBINSON: CONTRIBUTIONS FROM GRAY HERBARIUM. 261 
Benth., I cannot believe that this plant of Langlassé with its small 
leaflets glabrous above, its peduncles 1.2 cm. long, and silky-villous 
flowers, is the species which Bentham (in Hook. Lond. journ. bot., 
v, 88, & Trans. Linn. soc., xxx, 413) described as having leaflets in 
15—40 pairs, 2-24 lines long, puberulent on both surfaces, spikes very 
shortly pedicelled, and flowers nearly glabrous. 
M. stipitata, spec. nov. Fruticosa 3-5 m. alta, ramis flexuosis 
brunneo-griseis inarmatis vel aculeis gracilibus recurvatis subaxilla- 
ribus munitis; foliis 1 dm. longis rhachide pubescenti, pinnis circa — 
5-jugis subremotis, rhachillis pubescentibus prope basim geniculatis 
stipellatis 2 cm. longis, foliolis circa 10-jugis anguste oblongis sub- 
acutis 5 mm, longis 1.7 mm. latis margine parce ciliata excepto sub- 
glabris supra viridibus subtus vix pallidioribus; floribus spicatis 
ignotis; spicis breviter pedunculatis 2-3 cm. longis; legumine 
oblongo tenui compressissimo lateraliter crenato 4-5 em. longo 
1 cm. lato abrupte acuminato stylo persistente graciliter rostrato 
basi cuneato longe graciliterque stipitato valvis minutissime granu- 
latis inarmatis fuscescentibus plus minusve lucidis, stipite 5-10 
mm. longo, seminibus 8.— Mexico: on mountains above Iguala, 
Guerrero, alt. 1230 m., 5 Octeber, 1900, C. @. Pringle, no. 8406 
(type in hb. Gr.). 
This number was distributed as MW. polyantha, var. levior, but 
on re-examination it is found to differ from that plant in the long- 
stiped pods and more numerous pinnae and leaflets. To M. 
stipitata may be referred Rose & Hay’s no. 5331 (hb. U. S. 
nat. mus.), collected near Puenta de Ixtla, Morelos, 4 July, 1901, 
the only difference being the somewhat broader spines on the older 
branches. The flowers present in this specimen are white with 
shortly 4dentate calyx, turbinate 4-lobed corolla, the lobes being 
broadly lanceolate and glabrous, and the stamens 8 in number. 
The affinity of M. stipitata is evidently with M. polyantha, Benth. 
4. Norres on some Potygonums OF WESTERN NortTH AMERICA. 
While revising the New England Polygonums of the section 
Avicularia some months ago,’ I found occasion to examine several 
' See Rhodora, iv, 65-73 1902). 
