Vol. 32, pp. 41-44 April 11, 1919 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



NEW PACIFIC COAST PLANTS. 

 CHARLES V. PIPER. 



The following species of plants are described partly from 

 recently collected specimens and partly from material that has 

 accumulated in the National Herbarium. Most of them belong 

 to highly critical genera. The most noteworthy perhaps is 

 the new Cryptantha, the second American species with perennial 

 woody stems. 



Sidalcea nelsoniana, n. sp. 



Perennial 60-90 cm. high, the stems up to the inflorescence glabrous 

 or bearing a few more or less retrorse mostly simple short hairs; leaf- 

 blades orbicular in outline, glabrous above, sparsely hirsutulous beneath, 

 5-10 cm. broad, the lower ones 7-lobed, the lobes incisely dentate with 

 3-5 obtuse teeth, the upper leaves increasingly deeply cleft, the upper- 

 most divided to the base into linear entire or more or less toothed segments; 

 lower petioles 2-4 times as long as the blade, glabrous to sparsely hirsute; 

 stipules lanceolate, acute; racemes dense, erect, panicled; bracts linear; 

 pedicels shorter than the calyx, densely stellate-puberulent ; calyx sparsely 

 and minutely stellate-puberulent, at length loosely reticulate-veined, the 

 broadly triangular acute lobes little longer than the tube; petals rose- 

 colored, emarginate at apex, about 1 cm. long; stamineal column re- 

 trorsely pubescent; carpels nearly smooth, not reticulate, minutely and 

 sparsely puberulent. 



Allied to S. campestris Greene and S. oregana (Nutt.) Gray. From the 

 former it is easily separated by the smaller rose-colored corollas, the shorter 

 almost glabrous calyx-lobes, and the nearly smooth carpels; and from the 

 latter by the simple pubescence, shorter calyx-lobes, and smaller flowers. 

 The species is apparently restricted to the Willamette Valley of Oregon, 

 where it was collected by Thos. Howell in June, 1880, and recently by 

 Prof. J. C. Nelson as follows: Salem, No. 2233, July 17, 1918 (type), and 

 No. 650, June 5, 1916; Eugene, No. 332, July 14, 1915; Independence, 

 No. 2270, June 22, 1918. 



12— Proc. Biol. Soc. Wash., Vol. 32, 1919. (41) 



