BOSE MEXICAN A.ND CENTRAL AMERICAN PLANTS. 109 



inner ones ci Hate; petals white, veined with red, n nun. long; frail narrow, 3 cm. 

 I.uil:. pubescent. 



I", s. National Herbarium no. 161465, collected by C. G. Pringle and I. Lo 

 near Buena Vista Station, Hidalgo, altitude 2,550 meters, L9 3 84). 



Geranium pringlei Rose, Bp. nov. 



Perennial; Btems erect, about 30 cm. high, very pilose, especially at base, the upper 

 part of the Btem and inflorescence \\ Ltfa aumeroua purple stipitate -land-; basal • 

 long-petioled, white-pilose, especially below tin- blade, deeply lobed, each lobe cleft 

 and sharply toothed; Btem leaves Bomewhat Bimilar but Bhorter-petioied; peduncles 

 usually 2-flowered; pedicels Bhort, I to 2 cm. long, densely glandular-] 

 sepals lanceolate, faintly 3-nerved, the inner ones ciliate; petals blue, Large; fruit 

 linear, pubescent, with stipitate glands. 



Type U.S. National Herbarium no. 461451, collected byC. ( >. Pringlein meadows, 

 Cuyamaloya station, in eastern Hidalgo, altitude 2,490 metess, August 2, 1904 no. 

 8978). 



0XALIDACEAE. 



INTRODUCTORY NOTE. 



The breaking up of Oxalia by Dr. J. K. Small" into several genera 

 has been variously received by botanists. My own view of the sub- 

 ject is that his ground has been well taken and his treatment is followed 

 in this paper. Oxalis proper is not found in Mexico, but all the segre- 

 gates made by Doctor Small are represented, and in addition to these 

 Biophytum and Pseudoxalis, the latter here described forthe first time. 



For more than ten years I have been studying the Mexican material 

 of this family, in which I have found many new species, some of them 

 here first described. 



SOME MEXICAN SPECIES OF IONOXALIS. 



In Mexico Ionoxalis might well be called the harbinger of spring, 

 for it is one of the first plants to respond to the rains which break up 

 the long dry season and is the very first to give color to the landscape. 

 One may travel for many miles north of the City of Mexico and see 

 the high valleys and plains blue. pink, or white with Ionoxalis while 

 most other vegetation has hardly started. Of the 35 named specii 

 Oxalis credited to Mexico and Central America bv Hemslev L5 belong 

 to this genus, but the actual number is greatly in excess of this figure. 



The genus ha- a wide range both horizontal and alt itndinal. It La 

 scattered over the entire length and breadth of the country, reaching 

 from near the sea level to the tops of many of the high mountains; it 

 grows on the open plain, in wood-, in cultivated fields as a weed, on 

 nearly barren rocks, on dry exposed hillsides, and in sandy nooks 

 under the influence of the -pray of a waterfall. Some species grow 

 on nearly perpendicular cliffs, other- on the level so thickly set 

 together a- to form a sod, while other- are scattered or solitary. 



The following comprise most of the Mexican species. 



a Flora of the Southeastern United States, p. « >♦ > t . L903. 



