Thryptomene 



( 390 ) 



Thuya 



excellent, and this is the best method of com- 

 bating thrips upon Ferns. Sponging with soapy 

 water should follow the fumigations. 



Thrips Phylloxera is in some measure a friend 

 to the gardener. Its larvse, which result from the 

 eggs laid in the Phylloxera galls upon the Grape 

 Vine, feed upon the Phylloxera, and destroy 

 myriads of them. 



THRYPTOMENE. 



Heath-like shrubs (onl. Myrtaceaj) with small 

 flowers. They may be treated like the Basckeas, 

 although they are not commonly found in collec- 

 tions. Probably saxicola is the only species that 

 has been introduced. 



Principal Species : 



saxicola, 4', Jy., grh., wh. 



THUJA, THUJOPSIS (see THUYA). 



THUNBERGIA. 



Evergreen stove or intermediate house climbers 

 (ard. Acantbaceas). Alata and its varieties are 

 hardier than the rest, and make fine subjects for 

 hanging baskets to decorate the conservatory or 

 verandah. Propagation, by seeds sown in spring 

 in light soil. They must be placed in a warm, 

 moist atmosphere in a propagating case or over a 

 gentle hotbed. Prick off and pot on the young 

 plants as may become necessary. Cuttings may 

 be rooted in sandy soil under a bell-glass over 

 bottom heat in July. Soil, fibrous loam and peat, 

 with a little thoroughly rotted manure and some 

 sand. Thunbergias are attacked by red spider, 

 and for this reason are best treated as annuals. 

 When cultivated as perennials the growths require 

 to be severely thinned out during winter. If 

 crowded they soon become ineffective. 



Principal Species and Varieties : 

 alata, 5', sum., yel. ; fine fragrans, 5', Je., wh., 



vars. are alba, wh. , and fragrant ; the var. kevis 



aurantiaca, or. has little odour, 



coccinea, 5', Jy., sc. grandiflora, 12' to 20', 



erecta, 6', Jy., bl., or. ; Jy., bl. ; alba is a wh. 



alba is a fine wh., var. 



yel. var. (syn. Meyenia mysorensis, 10', spr.,yel., 



erecta). pur. (xyn. Hexacentris 



mysorensis) . 



Other Species : 



affinis, 5', Sep., vio., yel. Kirkii, 3', Sep., bl., vio. 

 angulata, 4', Je. laurifolia, 6 , sum., bl. 



capensis, 4', Je., yel. (syn. Harrisii). 



chrysops, 3', Je., bl., vio. natalensis, 3', Jy., bl. 

 hawtayneana, 10', Je., sc. vogeliana, 10', sum., bl., 



(syn. Meyenia haw- vio. (syn. Meyenia 



tayneaua). vogeliana). 



THUNIA. 



Handsome and graceful stove Orchids (ord. 

 Orchidaceie). Flowers large, borne in pendent 

 clusters. Though well known horticulturally as 

 Thunias, botanists have now placed these plants 

 under Phaius, of which genus they form the 

 deciduous section. Propagation, by separation of 

 the growths at potting time. Soil, equal parts 

 fibrous peat and fibrous loam, with a little dried 

 cow manure and sand. Half fill the pots with 

 crocks. Pot when new growths appear, generally 

 about February. Give little water until growth 

 is vigorous, then increase the supply, subsequently 



Thrixspemnum (si-e, Sarcorhiliis). 

 Throatwort (see Campanula Tracltelium). 

 Thunder Plant (sec Sempmrimtm Tcetorum). 



giving weak liquid manure at every third watering. 

 Syringe freely and provide plenty of heat. After 

 flowering gradually reduce the water supply as 

 the growth matures, finally withholding it during 

 winter. 



Principal Specieis and Varieties : 



[NOTE. s. = sepals, p. = petals, 1. = lip.] 

 alba, 2i' to 4', sum., s. p. deep pur., 1. pur, 



and p. wh., 1. wh., wh., yel. 



pur. ; Dodgsoiii, with winniana, larger, s. 



1. marked yel., and and p. deep ro., 1. 



nivalis, wh. , are fine malted crim. pur. 



vars. Marshalline, 3', sum., s. 



Bensonfe, 2^', sum. , s. and and p. wh., 1. wh., or., 



yel. (syn. marshalliaiia). 



Principal Hybrids : 

 inversa (Bensouse X Mar- ro. , mauve, 1. wh., 



shalliic), deeper colour mauve, keeled yel. 



than veitchiana. veitchiana (Marshalliu 1 X 



magnifica (bryineriana X Bensonai), '2\', sum., 



Bensonaj). s. and p. wh., flushed 



superba (veitchiana X pur., 1. wh. , marked 



Bensonae), s, and p. rosy pur. , or. yel. 



Other Species : 



bryineriana, 3', sum., s. pulchra, 2J', sum., s. and 

 and p. wh. , 1. wh., p. wh. , 1. wh. ,br. , yel. 



marked crim. pur. , keels whmiana (see Beusonai 

 yel., red; probably var.). 

 natural hybrid (Mar- 

 shallioB X alba). 



THUYA (including THUTOPSIS and BIOTA). 

 Description. Hardy evergreen ornamental trees 

 or shrubs (ord. Coniferse), of service for )-arks 

 and pleasure grounds, while the smaller varieties 

 of occidentalis may be used on large rockwork. 

 They have unisexual flowers, the fruit being 

 produced singly at the end of short branch- 

 lets, and pendulous. By some authors Biota 

 and Thuyopsis have been considered distinct 

 genera. They are divided into Euthuya, with 

 pendulous cones, scales not thickening upwards, 

 and bearing two- to three-winged seeds, e.g. T. 

 occidentalis, T. gigantea, and T. japonica ; liiota, 

 cones erect, with thickened scales prolonged at the 

 apex into a curved or horn-like process, and bearing 

 two wingless seeds, e.g. T. orientalis ; Thuyopsis, 

 cones sub-pendulous, with scales much thickened at 

 the apex, and bearing four- to five-winged seeds, e.g. 

 T. dolabrata. The very ornamental dolabrata makes 

 a good lawn tree. Gigantea is a tall, cone-like 

 tree with branches to the base where it has space ; 

 its timber is largely used in North America. 



Propagation. By seeds sown under glass in 

 spring, the seedlings being afterwards planted in 

 beds ; also by cuttings in a cold frame in August, 

 or at other times in heat, under bell-glasses. 

 Soil. A moist, retentive loam. 

 [NOTE. The synonymy is that of the Manual of 

 the Conifef<p^\ 



Principal Species and Varieties : 

 dolabrata, SO', branches gigautea, ISO', brandies 

 horizontal or depressed, close set, spreading, 



ITS. in four rows, in Ivs. in decussate pairs, 



pairs, silvery beneath, yel., grn. on upper 



cones eight to ten scales side, darker on lower, 



(yns. Thuyopsis, Thu- cones in clusters on ends 



jopsis, or Tlmiopsis of branchlets, eight to 



dolabrata). Japanese ten scales (si/itx. plicata 



Thuya. of Don and Menziesii). 



tetevirens, dwarf shr. , atro-virens, dark grn. 

 branchlets slender, Ivs. aurea, light yel. (syn. 

 small (.\'/. naiia). variegata). 



variegata,tips generally aureo-variegata niicl au- 

 pale yel. or cream. rescens resemble above. 



