OF A HIS AND SCIENCES. 103 



VII. 



CONTRIBUTIONS FROM THE GRAY HERBARIUM OF HARVARD 

 UNIVERSITY, NEW SERIES 



III.* — ADDITIONS TO THE PILENOGAMIC FLORA OF 

 MEXICO, DISCOVERED BY C. G. PRINGLE 



IN 1891-92. 



By B. L. Robixsox and II. E. Seaton. 



Presented January 11, 1893. 



Thalictrum tomentellum. Polygamo-dioecious: stem striate, 

 fistulous, fiuely 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 ■_>-.'! 

 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. 1143). 

 Differing markedly in its fine soft pubescence from various allied 

 species. 



Poeygala Michoacana. Perennial, glabrous: stems Beveral, 

 slender, erect, approximate, angulate, simple, or with a few long -len- 

 der erect branches: leaves small, lance-linear, scarcely spreading, 

 sessile, very sharply acuminate, 2-4 lines in length, not exceeding 

 line in breadth: spikes terminal, 1-2 inches long: bracts caducous, 

 awl-shaped, very acute, purple, % line long: flowers small. Bhort- 

 pedicelled, nodding, deflexed m fruit: sepals narrow, appearing 

 acuminate through the infolding of the margins, greenish white with 

 purple midribs, the three smaller acute, the alae pointed bul obtuse, 



* The two papers published by B L. Robinson in these Proceeding! 

 XXVI. pp. 164-176, and Vol. XXVII pp. 166-186, are regard< « I 



and II of this series. 



