ENUMERATION OF CONIFERS 249 



resin-ducts, even if the leaves of the sterile branches have the resin-ducts 

 marginal. 



A. Leaves without stomata above (or sometimes with few in- 

 complete hnes of stomata near apex in Nos. 1, 18, and i5). 

 B. Branchlets deeply grooved, particularly on two-year-old 

 branches, 

 c. Pubescence lacking on branchlets: leaves with internal 



resin-ducts 14. J. homolepis 



CO. Pubescence of branchlets brown, in the grooves: leaves 



with marginal resin-ducts 15. A. spectabilis 



BB. Branchlets not or slightly grooved. 



c. Under surface of leaves without conspicuous white or 

 glaucous bands (sometimes fairly conspicuous in A. 

 chensiensis) . 

 D. Apex of leaves acutish to spiny-pointed. 



E. Cones violet-purple: leaves of upper ranks partly 

 recurved; resin-ducts marginal: winter-buds 



very resinous 11. ^1. recurvata 



EE. Cones green: leaves spreading at nearly right 

 angles or upper ranks directed forward: resin- 

 ducts internal: winter-buds thinly resinous 12. /I. holophylla 



DD. Apex of leaves emarginate or bifid: resin-ducts mar- 

 ginal. 

 E. Cones green: leaves more or less pectinate: buds 

 not or slightly resinous. 



F. Leaves emarginate: branchlets glabrous 10. A. chensiensis 



FF. Leaves sharply bifid (at least in young plants) : 

 branchlets slightly grooved, hairy in the 



grooves 1.3. A. firma 



EE. Cones purple: leaves of upper ranks directed for- 

 ward, slender, often curved, bifid at apex: buds 



resinous IG. .4. Pindrow 



CO. Under surface of leaves with 2 white or glaucous sto- 

 matic bands. 

 D. AU branchlets more or less pubescent. 

 E. Buds resinous. 



F. Foliage more or less pectinate. 

 G. Winter-buds very resinous. 



H. Leaves distinctly pectinate, 13^-2^ 

 inches long: branchlets soon glabrous 



and lustrous 28. ^. grandis 



HH. Leaves not all strictly pectinate, l^-l^/i 

 inches long. 

 I. Apex of leaves acute to obtusish; resin- 

 ducts marginal \1. A. religiosa 



n. Apex of leaves truncate to emarginate; 



resin-ducts internal %5. A. balsamea 



GG. Winter-buds slightly resinous: leaves very 

 white beneath, to 1^^ inches long, sharply 



bifid: branchlets slightly grooved 6. A. Faxoniana 



FF. Foliage not pectinate. 



