ENUMERATION OF CONIFERS 



217 



Jvniperus Sanderi,'H.ori.). Sander Retinispora. Fig. 41. Of low subglobose 

 habit with bluish-gray, linear, spreading, blunt leaves about I inch long, 

 thickish, marked with a green line above. 



Geographical variety: Var. fonnosana, Hayata. Tree to 130 feet tall; 

 branchlets slenderer and thinner: cones subglobose, about 3^ inch across; 

 seeds smaller. Formosa. — Introduced to the Arnold Arboretum by E. H. 

 Wilson in 1918. Probably hardy only in the Southern States and California. 



5. C. Lawsoniana, Pari. {Cupressus Lawsoniana, 

 Murr. C. Boursieri, Decne.). Lawson C. Fig. 42 

 and Plate XIX. Tree to 200 feet, with horizontally 

 spreading and usually pendulous branches; bark 

 reddish-brown, thick, divided into rounded ridges 

 covered with small scales; branchlets flattened, frond- 

 like arranged in horizontal planes: leaves closely 

 appressed, obtuse or somewhat acute, usually bright 

 green, marked below with often indistinct white 

 streaks, with a gland on the back : staminate catkins 

 bright red (yellow in all other species) : cone globose, 

 about 3^ inch across, red-brown and often glaucous; 

 scales 8, with a thin reflexed mucro, each with 

 2-4 broad-winged seeds. Southwestern Oregon to 

 northwestern California. — Introduced in 1854 to 

 England. Hardy as far north as New York and 

 in sheltered positions to Massachusetts. This is one of the most beautiful 

 conifers and it forms in cultivation usually narrow pyramidal trees densely 

 furnished to the ground with branches; it is very variable and about 80 

 garden forms are known in European nurseries and collections. 



Color forms: Var. albo-spica, Beiss. Cream C. Tips of branchlets creamy- 

 white, of slender habit. Var. argentea, Beiss. {Cupressus Laicsoniana argentea, 

 Gord.). Of slender habit, with very glaucous almost silvery foliage. Here 

 belongs "Silver Queen." Var. lutea, Beiss. Golden Lawson C. Of compact 

 habit, young growth clear yellow. Var. glauca, Beiss. Steel C. Foliage of 

 metallic, glaucous tint. One of the hardier forms. Here belongs "Triomphe 

 de Boskoop." 



Forms of upright or columnar habit: Var. Alumi, Beiss. Scarab C. Of 

 columnar habit, foliage very glaucous, with a bluish metallic hue. The 

 best blue columnar form. Var. Fraseri, Beiss. Similar to the preceding, but 

 less narrow in habit and with dark blue foliage. Var. erecta, Sudw. (var. 

 erecta viridis, Beiss.). Green Column C. Dense columnar habit and bright 

 green foliage. One of the most beautiful varieties, but somewhat tender. 

 Var. "erecta glauca," Beiss. Blue Column C. Similar in habit, but with 

 glaucous foliage. 



41. Chamsecyparis obtusa 

 var. ericoides. 



