1906] Plants from the Canadian Rockies and Selkirks. 107 



tandrous. In all the forms the color of the flowers is similar, a 

 brick red, but in P. macrophyllum it is rather deeper in shade 

 than in the other species. 



Following- are descriptions not only of those species hitherto 

 undescribed but also of P. Myrsinites and of P. macrophyllum. 



Pachystima Afyrsinites, sp. nov. 



Twig-s short, dense, radiate, sienna brown with 4 narrow dark 

 ridges, the internodes 6-10 mm. long, the leaves densely and 

 decussately spreading, nearly sessile or shortly petiolate, the 

 petioles suddenly contracted beneath into the flat midrib, lamina 

 sub-rotund to oval and elliptic, the veins very obscure in 3-4 pairs, 

 radiating, the margin dentate, teeth not incurved, thickened and 

 revolute below, thinning out above, yellowish-green above and 

 below, thick, opaque. 



Flowers odorless, very numerous, densely clustered in fascicles 

 of 5-6, rarely 3-4, on arrested, bi-bracteolate branches springing 

 from axils of foliage leaves ; sepals broadiy oval, the midrib faint 

 or absent, apex rounded ; petals oval to ovate, nearly as broad 

 as long ; stamens 4, inserted into a quadrate disc, filaments twice 

 the length of the anthers ; flowers slightly protandrous to gyno- 

 monoecious ; style short, thick, stigma rounded. Fruit scanty. 



Pachystima macrophyllum, sp. nov. 



Twigs elongate, loosely spreading in one plane, cinnamon 

 brown, longitudinally 4-ridged, the ridges dark brown, the inter- 

 nodes 10-20, usually 15 mm. long, the leaves arranged in one 

 plane and springing from between the stem ridges, shortly petio- 

 late, the peHoles gradually contracted into the leaf midrib, lamina 

 oval-elliptic to oblanceolate, the veins evident, in six pairs, 

 longitudinally oblique, the margin incurved-toothed from near the 

 middle upwards, strongly thickened and revolute, glaucous green 

 above, bright green below, translucent. 



Flowers few, in fascicles of 2-3, sometimes 1, on short 

 branches in axils of foliage leaves ; sepals ovate, contracted at 

 base, the midrib usually prominent, the margins slightly toothed, 

 apex pointed ; petals broadly ovate, twice longer than broad, 

 finely but irregularly toothed along upper margins, apex rounded ; 

 stamens 4, inserted into a quadrately circular disc, filaments and 



