Thalictrum 



( 387 ) 



Theodolite 



bl. ; will flower in grh. 

 iii sum. 



Principal Species : 

 doalbata. 6', Jy., bl.; best 



ill a tub of water, 

 geuiculata, 2', Aug., St., 



THALICTRUM. (MEADOW RUE.) 



Hardy herbaceous perennials (ord. Ranuncu- 

 lacea;) of considerable beauty, both in flowers and 

 foliage, and quite indispensable in the mixed 

 border. Propagation, by division in spring. Soil, 

 moist sandy loam, mixed with leaf mould. 



Principal Species and Varieties : 

 adiantifolium (aee minus). aquilegifolium, 3', Je., 

 anemonoides, 3', Ap.,yel. pur.; atropurpureum 



(SI/H. Anemone thalic- is a fine var. 



troides). Chelidonii, 21', Je., pur. 



angustifolium, 3', Je., minus, 1', Je., pale yel. ; 



yel. ; uigricans is a flue many very fine vars. 



var. 



Other Species : 



iilpiuum, 6", Je., yel. Delavayii, 3', sum., pur. 



calabricum, 3', Jy., yel. flavum, 4', Je., or. ; sphse- 

 Cornuti, 3', My., yel. rocarpum is a good var. 



cultratum, 3', Je., green- glaucum, C', Je., yel. 



ish yel. squarrosum, 1', Je., yel. 



(syn. trigyuum). 



THAMNEA. 



Greenhouse evergreen shrubs (ord. Bruniaceaa). 

 Propagation, by cuttings in spring, in very sandy 

 soil, under a bell-glass. Soil, fibrous, sandy loam, 

 with a little crushed charcoal. 



Only Species : 



uninora, 1', Ap., wh. 



THAMNOCHORTUS. (SHBUBBY 

 GKASS.) 



Greenhouse perennial herbs (ord. Restiacese) 

 from South Africa. The flowering stems are Rush- 

 like. Dichotomus is the principal species, but it 

 lias nothing to recommend it to gardeners. 



THAPSIA. (DEADLY CAIUIOT.) 



Greenhouse perennials (ord. Umbelliferac), pro- 

 duriiig a Carrot-like root, and attractive on 

 account of the large, ornamental leaves. Prop- 

 agation, by seeds. Soil, mellow loam. 



Principal Species : 



decipiens, 6', Jy., wh. garganica, 3', Jy., yel. 



cdulis, 4', My., wh. (syn. villosa, 4', Je., yel. 



Mouizia edulis). 



THELEPHORA. 



A genus of Fungi whose members occasionally 

 do some damage to living trees. They are closely 

 allied to the true Mushrooms, but differ from them 

 in having the hymenium smooth w ridged and 

 warted. The texture also is leathery. Several 

 species are to be found burrowing into the trunks 

 of trees. Laciniata may be distinguished by 

 having its reproductive parts disposed as rusty 

 brown, semicircular, horizontal plates, several of 

 these plates lying close together, the one over- 

 lapping the other. Young trees are usually 

 :itl,-icked, rarely old ones, and the fungus is gener- 

 ally to be seen on the collar of the plants, close to 

 the ground ; occasionally it takes up its abode in 

 the soil. Perdrix attacks Oaks very frequently in 

 Germany, the affected wood turning reddish brown, 



TliiimiiiH'iiliiaiiiit (nee Ariindinari/i). 

 Tliiimtinjitrrix (wv Asplniium). 

 Tlnili-li 1'n/iii [nir Kuterpe, Sabal, and Thrinax). 

 T/ica (.-.(/ 



hdy. ann. or bien., ray 

 florets yel. , disc pur. 



and showing mottles like those of a partridge, 

 whence the specific name. Hirsuta, more cor- 

 rectly Stereum hirsutum, is common in Britain 

 upon dead stumps ; it also attacks Oaks, according 

 to Professor Hartig. The removal and destruction 

 by fire of attacked trees seems to be the only pos- 

 sible remedy. Nothing can be done to save the 

 infected specimens, as the mycelium of the fungus 

 is internally disposed. Diseased branches should 

 be promptly excised. 



THELESPERMA (syn. COSMIDIUM). 



Stove, greenhouse, or hardy herbs or sub-shrubs 

 (ord. Composite). The hybrid named below re 

 quires the same culture as the popular Coreop- 

 sises. 



Principal Species and Hybrid : 

 burridgeanum (filifolium filifolium, 1' to 2', sum., 



X Coreopsis tinctoria), 



Je., Sep., hdy. ami., or., 



yel., blk. 



THELYMITRA. 



Greenhouse terrestrial Orchids (ord. Orchidaceae), 



of no special garden value, and rarely grown. 



They may be treated in the same way as the 



Bletias. 



Principal Species : 



carnea, 6" to 10", My., ixioides, 1' to 1J', My., 

 pk., Btems slender. bl. 



graudiflora, 2', greyish longifolia, 1', My., bluish 



bl. , twenty-five to thirty pk. or lil., Ivs. long, 



in a large spike ; a narrow (syns. Forsteri, 



showy plant. graminea, and pauci- 



flora) . 



THEMISTOCLESIA. 



A small, obscure genus (ord. Vacciniaceae) of 

 evergreen shrubs. Propagation, by cuttings, in 

 sandy soil, in a close frame. Soil, fibrous loam 

 and peat in equal parts, with sand. 



Principal Species : 



coronilla, Jan., grh. dwarf shr., dark red. 



THENARDIA. 



Climbing stove shrubs (ord. Apocynacese), in- 

 creased by cuttings of the young shoots, taken off 

 with a heel of the old wood, in brisk bottom heat. 

 Soil, loam two parts, peat one part, both fibrous, 

 with sand. 



Principal Species : 



floribunda, 10', Je., St., pk., in bunches, showy. 



THEOBROMA (syn. CACAO). 



The value of this genus (ord. Sterculiaceae) 

 is wholly economic, seeing that Cacao is the 

 source of chocolate. Propagation, by cuttings of 

 ripened shoots, in sand, in a close case, with 

 bottom heat. Soil, equal parts peat and fibrous 

 loam, with sand. The plants do best if planted 

 out in a prepared border. Plenty of water. An 

 annual pruning is necessary to keep them within 

 bounds. 



Principal Species : 



Cacao, 20', My., St., calyx ro., corolla yel., fruits 

 yel. or red, 8" long. Cacao or Cocoa Plant, Choco- 

 late Nut Tree. 



THEODOLITE. 



A complicated and expensive instrument used by 

 land surveyors, and sometimes by landscape 

 gardeners, for calculating vertical and horizontal 

 angles, as well as heights and distances. Us use 



