370 PIiA2s^T NA3IES AND SYNONYMS 



a, T. Theyetia (L.) Lyons (C. ThevetiaL., T. nereifolia J uss. ) • 

 Tropical America. Yellow Oleander, Exile-tree, Quashy- 

 quasher. Bark febrifuge. , 



1989. THLASPI, L. Penny-Cress. Cruciferae. 



Greek name of a kind of Cress, perhaps from the "flat" pod. 

 Annual or perennial herbs. About 30 species, north temperate 

 and arctic regions; 5 in U. S. 



a. T. arvense L. Europe and northern Asia, adv. in U. S. Field 

 Penny-cress, Bastard Cress, Dish Mustard, Miihridate Mustard, 

 Treaclewort. 



1990. THRINAX, L. fils. Thatch Palm. Sabalaceae. 



From Greek, '^ three pointed". Low or medium sized fan- 

 palms. About 12 species, mostly of West Indies; 3 in U. S, 



a,. T. argentea (Jacq. ) Lodd. (T. microcarpa Sarg.). Florida to 

 Panama. Silver-top Palmetto (Florida), Chip-hat Palm, 

 Broom Palm (Panama), Silver Thatch-palm (Jamaica), Brick- 

 ley, Brittle-thatch. Leaves used for plaiting hats, baskets, etc. 

 (b) T. parviflora Swz. is called in Florida Silk-top Palmetto, 

 in the West indies, Koyal Palmetto. 



1991. THRYALLIS, Mart. Thryallis. Malpighiaceae. 



Syn. Galphimia, in part. Climbing shrubs. About 5 spe- 

 cies, mostly of Brazil; 2 in U. S. 



1992. THtJJA, L. (Thuya). Arbor Vitae, Cedar. Pinaceae. 

 The Greek name of an African tree with fragrant wood. 



Evergreen trees with scaly foliage. About 15 species, N. 

 America and eastern Asia; 2 in U. S. 



a. T. gigantea Nutt. (T. piicata Lambert not Donn. Has been 



confounded with Libocedrus decurrens Tor. ). Oregon and 

 northward. Canoe Cedar, Pacific Red Cedar, Oregon Red 

 Cedar or White Cedar, Yellow Cypress. Timber used for 

 canoes, shingles, etc. Bark fibre for mats, baskets, etc. 



b. T. occidentalis L. Canada, south to N. Carolina and Minne- 



sota. Arbor Vitae, White Cedar, Northern White Cedar, False 

 White Cedar, Feather-leaf Cedar, Indian Feather-leal ; Ger. 

 Lebensbaum; Fr. Thuya, Arbre de vie. B ranchlets a,nd volatile 

 oil therefrom, balsamic, stimulant, emmenagogue, etc. 



1993. THYMOPHYLLA, Lag. 1816. Thymophylla. Compositae. 



From Greek, "thyme leaved", a name not well chosen. Syn. 

 Hymenatherum, Cass. 1817, Lowellia, Gray 1849. Herbs or 

 under-shrubs with rather small flower-heads, rays generally 

 yellow. About 20 species; 14 in U. S., mostly western. 



1994. THYMUS, L. Thyme. Labiatae. 

 Ancient Greek name, signifying "fragrant". Herbs or low 



sub-shrubs with small leaves. About 50 species, Old World, 

 chiefly European. 



a. T. Serpyllum L. (T. Chamsedrys Fries). Europe and northern 

 Asia, adv. in U. S. Wild Thyme, Creeping or Horse Thyme, 

 Bank or Running Thyme, Shepherd's Thyme, Mother of Thyme, 



