1891.] Two new plants from the Cascade Mountains. 43 



Figs. 9, 10. Botrychium ternatum. 9, longitudinal; 10, transverse section. 



Figs. 11, 12. Similar sections of B. Virginianum. p. c, procambium 

 cylinder. 



Fig. 13. Transverse section of the root of B. ternatum just below the apical 

 cell. The outlines of the first three segments are distinguishable. 



Two new plants from the Cascade Mountains. 



B.. L. ROBINSON. 



(WITH PLATE VI.) 



In a small collection of phamogams from Mt. Rainier and 

 vicinity, sent by Mr. C. V. Piper to the Gray Herbarium, 

 two new species occur, which form the subject of the present 

 paper. One of them is more or less closely related to Luina 

 hypoleuca Benth. and Cacaliopsis Nardosnzia Gray, and is of 

 special interest, since it does not fall strictly within the limits 

 of either genus as now described. Since, however, both of 

 these genera are monotypic it seems highly injudicious to add 

 a third genus to the group, intermediate between the two, and 

 also of a single species. As will be seen from the description 

 that follows, the new species resembles, on the whole, the 

 older genus Luina more closely, the most important point in 

 which it differs from it being the entire or subentire base of 

 the anthers, in which respect it is more like Cacaliopsis. In 

 its sessile entire leaves, few-flowered oblong heads with few 

 rigid involucral scales, it accords with Luina. Its inflorescence 

 is still more racemose than in Cacaliopsis, and, as in that 

 genus, the upper bracts are adnate to the pedicels; in the 

 entire absence of pubescence from stem and leaves, in the 

 tawny pappus, and in some characters of the corolla it differs 

 from both. While highly probable that Luina should be 

 made to include Cacaliopsis, this point may well be left for 

 future discoveries to decide. The characters of the new 

 species are as follows: 



Luina Piperi. (PL VI, figs. 1-6). — Stem simple, virgate, 

 striate, glabrous: cauline leaves oblong-lanceolate, shortly acu- 

 minate, narrowed to sessile base, entire, in the single type 

 specimen green and glabrous on both sides; radical leaves un- 

 known: inflorescence racemose, one foot long; pedicels 2-6 

 lines lonir, together with the involucral scales somewhat to- 



