OF ARTS AND SCIENCES. 103 
Vil: 
CONTRIBUTIONS FROM THE GRAY HERBARIUM OF HARVARD 
UNIVERSITY, NEW SERIES. 
III.* — ADDITIONS TO THE PH NOGAMIC FLORA OF 
MEXICO, DISCOVERED BY C. G. PRINGLE 
IN 1891-92. 
By B. L. Ropryson anv H. E. Seaton. 
Presented January 11, 1898. 
THALICTRUM TOMENTELLUM. Polygamo-dicecious: stem striate, 
fistulous, finely and densely pubescent : leaves tripinnate: petioles 1-2 
inches long, tomentulose as well as the rachis and petiolules : leaflets 
suborbicular, subcordate, finely pubescent above, paler and tomentu- 
lose below, shallowly 3-lobed; lobes rounded, entire or with 2-3 
rounded teeth: inflorescence pyramidal, subnaked: sepals 4-5, ovate- 
elliptical, 2 lines long: stamens spreading; anthers with rather long 
setiform tips: fruiting heads nodding on the pedicels; carpels about 
10, scarcely stipitate, lanate, rugose-reticulate, hispidulous, very acu- 
minate, and tipped with a very long filiform finally deciduous style. — 
Low lands about Lake Patzcuaro, Michoacan, July, 1892 (n. 4143). 
Differing markedly in its fine soft pubescence from various allied 
species. 
PotyGaLa Micnoacana. Perennial, glabrous: stems several, 
slender, erect, approximate, angulate, simple, or with a few long slen- 
der erect branches: leaves small, lance-linear, scarcely sprea 
sessile, very sharply acuminate, 2—4 lines in length, not exceeding i 
line in breadth: spikes terminal, 1-2 inches long: bracts caducous, 
awl-shaped, very acute, purple, 3 line long: flowers small, short- 
pedicelled, nodding, deflexed in fruit : sepals narrow, appearing very 
acuminate through the infolding of the margins, greenish white with 
purple midribs, the three smaller acute, the ale pointed but — 
* The two papers published by B. L. Robinson in these Proceedings, Vol. 
XXVI. pp. 164-176, and Vol. XXVII. pp. 165-185, are regarded as Nos. IL 5 
and IL. of this series, 
