191 



The differences in present arrangement, resulting from this, are as follows : 

 lanceolata and Patagonica are placed in section two, instead of one ; while elongata 

 and heterophylla are placed in a third section. 



In the material examined it has been found necessary to establish two new 

 species, P. rubra and P. minima, which was done somewhat reluctantly. 



It has been found impossible to follow, in all particulars, the nomenclature 

 in the "List of Pteridophyta and Spermatophyta, Botanical Club, A. A. A. S." 

 There seems to be no good reason why varieties aristata and gnaphalioides of 

 Patagonica, and longifolia of Virginica should be raised to specific rank. Cer- 

 tainly if seed characters have any value in determining specific rank, the reason 

 would seem positive why they should still be considered as varieties. 



P. decipiens, on the other hand, is not to be included under P. maritima, 

 being clearly separable from it, as indicated below. 



The original description of P. Tweedyi was not secured. A single specimen 

 was examined, and on account of its seed characters was placed in section 1. 

 Judgment as to exact relationship must be suspended until more specimens and 

 the original description can be obtained. 



No specimens of P. sparsiflora were examined, but from the description given 

 in "Chapman's Flora of the Southern States," it probably belongs in section 2. 



All specimens of P. major, var. Asiatica, were referred to either P. major or 

 P. Eugelii. 



P. media is mentioned in the "List of Pteridophyta and Spermatophyta of 

 the United States," but is not described in "Gray's Manual," "Coulter's Rocky 

 Mountain Botany" or "Chapman's Flora of the Southern States." The specimens 

 examined were from Europe, and are not, therefore, included in this work. 



ANALYSIS OF THE SPECIES OF PLAXTAGO. 



H. Flowers perfect; stamens, 4; corolla not closed over fruit ; seeds oval in cross 

 section. 

 * Leaves broadly ovate, strongly veined. 



t Leaves and scape glabrous, or slightly hairy ; seeds light brown. 



P. cordata. 

 tt Leaves and scape glabrous, or slightly hairy ; seeds angled, black. 



+ Capsule ovoid, circumscissile at the middle, 8-18 seeded; seeds 



f mm. X I mm. P. major. 



Jt Capsule conical, circumscissile below the middle, 4-9 seeded ; seeds 



If mm. X I mm. P. Rugelii. 



