388 CLASS XXI. ORDER IX. 



rows of short, minute leaves, the two lateral rows longest. Each 

 leaf is furnished with a minute tubercle or gland on the back, 

 near its base. Cones extremely small, angular, and somewhat 

 spherical. 



The wood is light, soft, and very durable. It is used for 

 shingles, for wooden vessels, also for fencing and other pur- 

 poses where durability is required. This tree and the last are 

 found occasionally, but not frequently, in the neighborhood of 

 Boston. 



399. THUYA. 

 Thuya occidentalis. L. Arbor vita;. Hacmatack. 



Branchlets ancipital ; leaves imbricate four ways, 

 ovatc-rhomboidal, appressed, naked, tuberculated ; 

 cones obovate, the inner scales truncated, and gibbous 

 below the tip. 



This tree, remarkable for the flat or two edged form of its 

 twigs, is known in different parts of the country by the name of 

 White Cedar and Hacmatach. The twigs are much broader than 

 those of Cupressus Thuyoides, the cone loose with few long 

 scales, unlike the globular fruit of the Cedar. Wood soft, but 

 very durable.— In Maine, New Hampshire. 



400. ACALYPHA. 



AcALYPHA ViRGiNicA. L. Thrct seeded Mercury. 



Pubescent, leaves on short petioles, lance-oblong, 

 serrate; involucres subsessile, axillary, nerved, cut 

 into acute, crested segments. Mich. abr. 



An annual plant of ordinary appearance. Branches pubescent. 

 Leaves ovate-lanceolate, with a rather obtuse point, remotely 

 serrate or crenate at the edge, somewhat three nerved. Involu- 

 cres of the fruit axillary, hairy, on short stalks, their edge cut 

 into a number of long, acute, ciliated segments or teeth. — 

 Woods, Cambridge. — August. 



