i83 BOTANICAL GAZE TIE. 



the interests of the plant by increasing the surface through which ma- 

 terial for the plant's sustenance and growth may be absorbed. The 

 character of such material is determined by the nature of the respect- 

 ive media in which the organs vegetate -of shoots it is gaseous, of 

 roots aqueous. — J. C. Arthur, Uiiiv. of IVis. 



Explanation op Plate. — Trichomes of EcMnocyatia lohata, Torr. & Gr. : 

 drawn with camera hicida; uuiforuily magnified 250 diam. 



A. Vertical section of andrannum; the epidermal cells transformed into 

 trichomes. 



B. Short rigid hair from surface of mature leaf 



C. Cell from interior surface of an injured hypoc-otyiedonary stem ; free 

 portion of the cell-wall irregularly thickened; a jiseudo-trichome. 



D. Reticulated trichome from surface of andrcrcium. 



E. Capitate trichome on tlie point of a prickle of the ovary; inclined to 

 one side, as is connnon. 



F. Flat-headed tricliome from interior surface of ]ieriantli-cup; seen in 

 perspective. 



G. Trichome from surface of petal; its head somevvliat glandular. 



H. Vertical section of upper part of a cotyledcmary petiole; epidermis 

 changing into thin-walled hairs. 



M. Transverse section near tlie apex of a growing stem; It tiliform, and »t 

 capitate trichome. 



New Plants of New Mexico and Arizona. -Talinum 



HUMiLE. — Acaulescent, glabrous and very succulent; root with an ob- 

 long orange-colored tuber an inch long; leaves terete, 2-3 inches long, ly- 

 ing flat upon the ground ; the dichotomously branched scapes only halt 

 as long as the leaves. 5-10 flowered ; sepals pointed; petals light yellow, 

 changing to orange in d'-ying ; seeds black, marked with circular lines. 



On a rocky table land near the southern base of the Pinos 

 Altos Mountains, New Mexico, Aug. ii, 1880. The plant is probab- 

 ly rare, as only some eighteen specimens could be found. '1 he 

 flowers at 2 o'clock p. m. had not yet opened, hence it is one of those 

 species whose flowers open at evening and close in the morning. In 

 habit it is much like Cala/idriiiia pygi/ui'a ; it has the color and the seeds 

 nearly of T. aiirantiacuui, but is most distinct from that species, by its 

 habit, and its succulent herbage. 



LiNUM NeoMexicanum. — Annual or biennial, glabrous and 

 glaucescent; stems 1-21^ feet high, branched from the base, the 

 branches very strictly erect and nairowl)- i)aniculate for more than half 

 their length ; lowest leaves opposite, and when viewed from above 

 showing a cruciate arrangement, the upper alternate, all lanceolate, 

 or oblong, acute, sessile, entire ; pedicels 3-6 lines long, with margin- 

 al angles; sepals broadly lanceolate, scarcely equalling the capsules, 

 the margins sp.\ringly glandular denticulate ; corolla a half inch in 

 diameter, light yellow; styles Iree to the base ; capsule incompletely 

 10 celled. 



In woods of Pinus pondcrosa on the Pinos Altos Mountains, New 

 Mexico, August and September, 1880. A tall, graceful species, with 

 sometimes almost racemose inflorescence. 



BiGELoviA (Apludiscus) rupestris. — Less than a foot high, 

 much branched from the base, woody and brittle ; flowering branch 



