The cypress and juniper trees of the Rocky Mountain region . ark more rapidly and completely than less thrifty ones. Thejliage is a bright blue-green (glaucous). The minute, scalelike,acutely pointed leaves (PI. IV), about one-sixteenth of an inch longand closely pressed on old sprays, are thickened and keeled on theback, where in practically every case there is a comparatively largeresin gland, a characteristic which distinguishes the leaves from thoseof Arizona cypress. Young shoots bear closely pressed leaves fromone-fourth to one-half of an inch long, with very keen and more orless spreadi
The cypress and juniper trees of the Rocky Mountain region . ark more rapidly and completely than less thrifty ones. Thejliage is a bright blue-green (glaucous). The minute, scalelike,acutely pointed leaves (PI. IV), about one-sixteenth of an inch longand closely pressed on old sprays, are thickened and keeled on theback, where in practically every case there is a comparatively largeresin gland, a characteristic which distinguishes the leaves from thoseof Arizona cypress. Young shoots bear closely pressed leaves fromone-fourth to one-half of an inch long, with very keen and more orless spreading points (PI. V, a). The leaves die during the secondyear, turn a bright red-brown, and remain on the twigs for about 4years, after which they are shed slowly, and later these small branches i Reported to the writer in letter by Prof. C S. Sargent, Nov. 6, 1914. 2 According to Prof. J. W. Tourney (loc. cit.) some of the trees in the Natural Bridge grove (whichmust now be considered to be C glabra) are 3 feet in diameter. Bui. 207, U. S- Dept. of Agricultu. CUPRESSUS GLABRA: FOLIAGE AND CLUSTER OF NEWLY RIPENED CLOSED , Cluster of very old cones; 6, seeds (natural size and enlarged twice natural size). 10 BULLETIN 207, tl. S. DEPARTMENT OE AGRICULTURE. become ashy gray. The spherical cones x (Pis. IV, V) are borne onstout stems from one-fourth to one-half of an inch long (PL IV, a),and mature at the end of the second season. In diameter theyrange from seven-eighths to one-eighth of an inch, and are composedof from 6 to 8 2 scales, armed with large incurved, somewhat flat-pointed bosses. The mature cones are smooth, but conspicuously wrinkled, andcovered with a deep blue-gray bloom, which when rubbed off revealsa rich dark-brown color beneath. Very old cones (PL IV, a) areashy-gray, with bosses much less conspicuous 3 than in newly ma-tured cones (PL V). Immature cones of one seasons growth arelight reddish-brown, with areas of pale-bluish bloom. Mature conesma} remain on
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