222 



glandular pubescent or scabrous throughout, and the leaflets are 

 not merely "incised towards the apex," (Bot. Calif, p. l8i), but 

 they are deeply and equally cut-lobed nearly or quite to the 

 base into 2 to 5 parts; also the stipules are larger in outline and 

 more deeply fimbriated into filiform segments. 



Among the rounded stones of a moraine in Shasta Valley, near 



J 



Nama densa, n. sp 



Depressed, dense-leaved and hispid throughout, with white 

 hairs. Leaves lanceolate-hnear, less than ^ inch long, obtuse, 

 one- nerved, mostly approximate at the ends of the short branches, 

 the scattered lower ones narrowed to petioles ; flowers in the 

 axils, sessile, sepals linear, not thickened upward ; corolla very 

 small, tubular, about a line long, with minute lobes roseate, and 

 caducous ; filaments very slender inserted about midway of the 

 tube, anthers very small ; capsule oblong, corrugated, 12 to 16 

 seeded; seeds very small, distinctly rugulose. 



Near Edgewood, Shasta Valley, North California, on loose 

 volcanic soil. Forms hemispherical, dense mats two inches high 

 and four inches across. It is in the section with N. Iiisptd- 

 icni and N, dcmissiun of Gray's Syn. Flora of North America, 

 but abundantly distinguished by its depressed, dense habit, its 

 smaller flowers and seeds. Tune 28, 1889. 



Reviews of Foreign Literature. 



Durchhrechiin^ der zellwand in ihren Beziehiin<ren zicr Ortsbe- 

 xvcgiing der Bacillariacecn. Von Otto Miiller (Berichte der 

 Deutschen Bot. Gesellschaft, Heft 4, 1889). 

 The motion of diatoms in water has long attracted tlie atten- 

 tion of those conversant with the habits of these peculiar little 

 organisms. There are, at present, two theories held in respect 

 to the motion, called in German, " Ortsbewegung," or motion 

 from place to place. The first is called the osmotic, the second, 

 the protoplasmic theory. The first accounts for the motion by 

 the impulse given the cell by taking in and throwing out water, 

 according to the supposed chemical changes taking place within 



the cell ; the second, by the impulse caused by the motion of 

 protoplasmic threads which reach the surface of the diatom 

 through small pores in the wall. 



