BOTANY. rfl 



the apex, tipped with a simple stigma. Achenia pretty numerous, smooth, glabrous ; when 

 mature marked by a few thick and irregular longitudinal ribs ; tbe style deciduous by an arti- 

 oulation. Seed suspended from near the summit. 



•■ Although s ( > well marked by the oharaoters above cited, this plan! and the two of the pro- 

 posed first section evidently belong to the same genus, and thai intermediate between Horkelia 

 and Potentilla. The firsi seotion is more like Horkelia, from which the 20 stamens with lili- 

 form filaments (instead of in with broad or deltoid filaments) distinguish it. The second, 

 the foliage, resembles Potentilla, bul is distinguished by its definite Btamens in 

 three ranks, Ac. Dr. Torrey indicated the essential characters of this genus several veins ago, 

 but allowed the two species then known to him to he provisionally appended to Horkelia, Dr. 

 Newberry's discovery, however, renders it necessary to complete the separation. 'Pin- present 

 name is chosen to commemorate one of the oldest surviving botanists of the United States, the 

 venerable l>r. Eli Ives, formerly professor of materia medica and pharmacy iii Yale Coll 

 who, although he has published little directly npon botany, has rendered excellent Bervice 

 teacher of the science to a long series of pupils." A. Gray. 



Plate XI. Ivksia gracilis. Plant of the natural size. Fig. 1. A (lower. 2. A petal. 



3 ' Ion of receptacle, calyx, &C. 4. Flower spread on* fiat, to show the insertion and 



arrangement of the stamens; the ovarian receptacle cut wholly away. .">. A pistil, 0. The 



receptacle in fruit vertically divided. 7. A ripe achenium. 8. The same vertically divided. 



All the details more or less magnified. 



Horkelia cuneata, Lindl.; Torr. d- Gray. Fl. 1, />. 435. Shores of Klamath lake. 



Horkelia congesta, Hook.; Torr. d- Gr. Flor. l,jj. 434. Banks of Hat creek, northern Cali- 

 fornia. 



Frauaria California, Cham, d- ScIJecht. in Linncea, 2, p. 20 ; F. Chilensis, Torr. d- Gray, 

 I" r. 1. p. 44S, i7i port. Willamette valley. 



Frauaria Chilensis, Ehrh.; Torr. d- Gray, Flor. \,p. 448. Portland, Oregon ; November 1, 

 in flower. 



B 3A fraxin.efolia, Borr.; lAndl. Bot. Beg., t. 458; Hook. Flor. Bor.-Amer. 1, p. 199. 

 Common in northern California and Oregon. 



Pyrus riyularis, Dougl. in Hook. Flor. Bor.-Amer. 1,p. 203, t. 08; Torr. dk Gray, Flor. 1, 

 p. 171 ; Xutt. Sylv. 2, p. 22, t. 49. Pit river, northern California. 



Pyris Americana, DC. Prod. 2, p. 037; Torr. d- Gray. I. c. Cascade mountains, 0. T. 



Cerasfs mollis, Douyl. in Hook. Flor. Bor.-Amer. \ t p. 169. On Pit river and in « 

 mountains. 



\, Xutt. in Torr. d- Gray } Fl. I, p. 411. Common in mountains throughout 

 northern nia and Oregon. 



bcordata, Benth. PL Hartw. No. 1710. Sierra Nevada, near 1.. 

 Klamath lakes, August, in fruit ; fruit 1 tcellent. 



Amelanchikr Canadensis, var. alvifolia, Jbrr. <jb 6ra\ '•/'• '" ;; - Amelanchier alni- 



fulia, Xutt. Jour. J' ad. phiL 7. p. 22. 



Benth. i Hdrtweg. No. 1712; I /. PI. Fremont, p. 11. t 



Banks of Canoe creek, July 30, in flower : a very b . plant, ami well worth . 



lltivation. 



CALYCANTHACKE. 



tu us occidental:-. Hook, d Am. Pot. Beech, p. 340, t. B4. Sacramento valley. 



10Z 



