1914] GROOM—TRACHEID-CALIBER 299 
TABLE I1]—Continued 
WIDTH OF SPRING 
; DisTRIBUTION, SOIL, ALTITUDE, ETC. 
Aan emt Pacific 
bies— 
A, Fraseri........ BO. Sic, ees S.W. Virginia to Tennessee, 4000~6000 
an ft., on moist slopes. 
AE Se es Eee 33.5| Alaska to Arizona; 4000 ft. in British 
Columbia ; 12,000 ft. in Colorado; 
Q ine. 
Memeanincs......|..... len... 38.5| S. Oregon, 5000-7000 ft.; Sierra Nevada 
"4 6000-10,000 ft.; cool temperate. 
Ee one oes Paneer 39. | S. Colorado to California and arid 
regions of New Mexico and Arizona; 
ms” of Californian 
A ae Sierras; warm cool temperate. 
SIS Seeaae Senne 40 | British Columbia to Oregon, high moun- 
tain slopes, often with A. nobilis; cool 
temperate, 
A. balsamea.... .. ee ete) vee ia Labrador to mountains of $.W. Virginia; 
often in low swampy ground or on well 
drained soil, often with Picea alba; 
A. nobili cool temperate. _ ee 
ee da gs schon cc 41 | Cascade Mts., Washington to California, 
2500~5000 ft., often with A. amabilis; 
A. b Ww to cool temperate. 
SR soles ty: 41.5| California, 3000 ft., moist cool soil. 
coset OE! ee aa ae 49.5| Vancouver to California, Idaho, Oregon, 
Montana; near the coast on moist 
ground; in the interior on moist 
slopes; 2500-7000 ft.; warm temper- 
ate. 
ee 
associated with narrowness and wideness of spring tracheids in the 
different Species or genera is provided by Torreya, Chamaecyparis, 
Sequoia, and J uniperus; somewhat favoring the view are Cupressus 
and Picea; indifferent in indication from this standpoint are Abies 
and Larix, 
The enumerated species of Juniperus all seem to be actually or 
Potentially xerophilous in habitat, and, with one exception, have 
_ Very narrow spring tracheids (17-23 w). The one exception is 
J. *irginiana, which has rather narrow spring tracheids, and a 
remarkable range of distribution as regards climate and soil (it is 
Possible that the specimen of wood measured was derived from a 
tree growing in a moist site). 
Contrasting with Juniperus is Torreya, in which both species 
