M'Nab — A Revision of the Species of Abies. 681 



resin-canals are placed, one at each, side of the leaf, close to the under 

 side. The pallisade tissue is interrupted above by the presence of 

 stomata. 



The fibro-vascular bundle is double, the parts not placed very close- 

 together, the whole surrounded by a well-marked sheath. 



The figure (Plate 46, fig. 5) is drawn from a specimen grown in 

 the Royal Botanic Garden, Edinburgh, from seed sent by Jeffrey. 



I have examined nine specimens of this plant, six of them being* 

 cultivated, and three native specimens. In the Museum, Royal 

 Botanic Garden, Edinburgh, is a cone with a shoot having leaves tied to 

 it, which is marked " Picea Lowii (P. grandis). Oregon, Mr. Jeffrey, 

 1854." The cone is 4 inches long by 2^ inches wide. The scale and 

 seed are both large, the bract being very short. The part that is free 

 from the scale is broader than long ; the margin is toothed, with a sharp- 

 pointed apex, indeed, agreeing very well with Mr. Gordon's descrip- 

 tion. The number in Jeffrey's list is not given, and I failed to find 

 more than the one specimen of Jeffrey's. I have little doubt that the 

 seeds were mixed with those of Jeffrey's 393 and 409, and the three 

 things all sent out as P. lasiocarpa, Oregon Committee ; hence th& 

 name it receives in certain gardens. Lowiana was sent home by Mr. 

 "William Murray, as there is a shoot of it, without a cone, in the 

 Museum, in the Royal Botanic Garden, Edinburgh, marked " Picea 

 grandis. California, "W". Murray, Esq. Presented by A. Murray, Esq., 

 1860." In Kew Herbarium is a specimen marked, " JSTo. 3. California, 

 — Low, Esq., Clapton." It is also cultivated as Parsonsiana, and I 

 have received it as such from Edinburgh, and from Mr. Barron, Elvas- ' 

 ton Nurseries, per Dr. Masters. 



6. Pinus (Ahies) concolor, Engelm. Herb. ; Parlatore, D. C. Prod., xvi., 

 pars 2, p. 426, No. 103. JPicea concolor, Gordon, Pinetum, p. 155. 



Leaves about 1^ inch long, and iV inch broad, linear, curved, 

 twisted at base, rather obtuse at apex, stomata on both sides — about 15 

 rows on the upper side, and two bands below, each with about 8 or 

 10 rows of stomata. 



Transverse section of leaf. — Leaf about 2^ times as broad as thick, 

 rather tetragonous in form although much flattened, sides rounded, 

 upper surface convex with no furrow, below with a rather prominent 

 midrib. Hypoderma developed at the sides of the leaf, and below the 

 epidermis of the midrib, occasionally a few scattered cells in other 

 parts of the leaf between the rows of stomata. The resin-canals are 

 placed, one at each side of the leaf, close to the lower epidermis. The 

 pallisade tissue is not developed, owing to the presence of stomata on 

 both sides of the leaf. 



Fibro-vascular bundle double, the two parts rather widely separated, 

 and with a well-marked sheath surrounding the whole. 



The figure (Plate 46, fig. 6) is drawn from the specimen in Kew 

 Herbarium from Fendler, " PI. Novo-Mexicano," No. 828, 1847. 



