FIVE NEW SPECIES OF MEXICAN PLANTS. 



By J. N. Rose, 



Associate Curator, Division of Plants. 



The new species of Dahlia and I\>I!anthes described below have 

 flowered recenth" in the greenhouse of the Department of Agriculture, 

 and, as both are soon to be distributed, it is desirable to have their 

 names published at once. The new species of TLuchera is published 

 so that it may appear in a forthcoming number of the North American 

 Flora. The new Parnassia is the first species of the genus reported 

 from Mexico. The Nol'ma here described has long ])een known in our 

 collections under a wrong name. 



The type specimen of each of these species is in the United States 

 National Herbarium. 



POLIANTHES ELONGATA Rose, sp. nov. 



Bulb 12 to 35 mm. in diameter covered wi'th light-brown scales; 

 stem 80 to 90 cm. high, glabrous throughout, reddish at base, glaucous 

 above; basal leaves elongated, oblanceolate, 30 cm. long, 10 to 12 mm. 

 broad near the apex, green, hardly if at all glaucous, flat above, 

 trough-shaped below; stem leaves 6 or 7, much reduced above, becom- 

 ing bract-like; raceme of 20 or more pairs of flowers; bracts ovate- 

 linear, acuminate, as long as the pedicels, 10 to 15 mm. long, reddish; 

 corolla red, slender, 2 cm. long, bent just above the base almost at 

 right angles with the axis of the ovary; lobes short, rounded, some- 

 what spreading; stamens attached to the perianth near its base; anthers 

 6 mm. long, their tips just projecting from the mouth of the perianth; 

 styles finally projecting a short distance beyond the mouth of the 

 perianth. 



Collected by Frederick Chisholm from Hacienda de Trinidad, 

 Arcelia, Guerrero, June, 1901: (Section Plant Intro. Dept. Agr., 

 no. 11260). 



Proceedings U. S. National Museum, Vol. XXIX— No. 1427. 



437 



