ila] 



Etje tfcatfurj) of 33atanii. 



1146 



the plant conspicuous, when it often 

 perhaps but for them would remain' un- 

 noticed among other weeds. T. perfolia- 

 tum, a rare species occasionally found in 

 chalky pastures, is best distinguished by 

 its pouches, which are inversely heart- 

 shaped. French : Bourse cle Pasteur ; Ger- 

 man : Hirtentasche. [C. A. J.] 



THLASPI BLANC VIVACE. (Fr.) Iberis 

 sewpervirens. — DE LA PETITE ES- 

 PEOE. Iberis amara. — DES JARDI- 

 NIERS. Iberis umbellata. — JAUNE. 

 Alyssum saxatile. — VIVACE. Iberis 

 seinperfioretis. 



THLIPSOCARPUS. A genus of Com- 

 posites, whose species have a similar habit 

 and form of leaf to those of Taraxacum. 

 The involucre consists of two rows of or- 

 gans—the inner of numerous erect scales, 

 the outer of eight or nine spreading 

 bracts ; the corollas are all strap-shaped, 

 yellow above, purplish below ; the outer 

 fruits are compressed, rough, marked 

 on one side by two or three ridges, the 

 inner more slender, cylindrical, tapering 

 towards the top ; the pappus is uniform, 

 and consists of two rows— the inner row 

 of five long scales, prolonged at the 

 apex into a rough hair ; the outer row of 

 numerous rough hairs, shorter than the 

 inner series. The plant is a native of 

 Gibraltar and the adjacent parts of Spain. 

 The generic name refers apparently to the 

 roughness of the fruit : it is derived from 

 thlibo ' to rub against.' [M. T. M.] 



THOMASIA. The name of a genus of 

 shrubs, natives of the south-western dis- 

 tricts of Australia, and belonging to the 

 Biittncriacece. The leaves are covered with 

 star-shaped hairs, aud provided with per- 

 manent stipules ; the flowers are borne in 

 clusters, opposite the leaves, and have 

 each a tripartite bract at the base of the 

 petaloid bell-shaped five-parted calyx ; a 

 corolla with five small scale-like petals, 

 or none ; ten stamens, Ave of them sterile, 

 the filaments awl-shaped, distinct or 

 united; a three-celled ovary; and a cap- 

 sular fruit, with few seeds, provided with 

 a little strophiole or crest. Five or six of 

 the species are valued in this country as 

 elegant greenhouse plants. The flowers 

 are white or purple, and the plants have 

 very much the general appearance of some 

 species of Solarium. [M. T. M.] 



THOMASSINIA. A small genus estab- 

 lished to include several perennial umbel- 

 liferous herbs, which differ from Angelica 

 in the want of general or partial invo- 

 lucres; in the free calyx, with five ovate 

 acuminate teeth ; in the roundish fruit, 

 with five equidistant ribs; and in the 

 acutely carinated commissure of the car- 

 pels. The three species are natives of the 

 Mediterranean region. [W. C] 



THOMPSONIA. A shrub, native of 

 Madagascar, has been considered to form 

 a separate penus of Passifloractce, under 

 the above name. It has unequally pinnate 

 leaves, axillary tendrils, and flower-stalks 



bearing Ave flowers. These latter have 

 four sepals, four smaller petals, a corona 

 of fine threads arranged in one row, and 

 eight stamens. By these characters it 

 may be distinguished. [M. T. M.] 



THONNINGIA. A genus of Balanopho- 

 racece, comprising a fleshy parasitical leaf- 

 less plant growing on the roots of trees 

 in Western Tropical Africa. The root- 

 stock is brown, and sends up flower-stalks 

 clothed with red scales; the stamens are 

 united together into a solid column, 

 which is garnished with a few scales to- 

 wards its base. [M. T. M.] 



THORA. Banunculus Thora. 



THORN. A common name for various 

 thorn-bearing trees, especially applied in 

 this country to the Cratcegus Oxyacantha. 

 — , BLACK. Primus tpinosa. — , BUCK. 

 Rhamnus. — , BUFFALO. Acacia latro- 

 num. — , CAMEL'S. Alhagi Camelorum. 

 — , CHRIST'S. Paliurus aculeatus. — , 

 EGYPTIAN. Acacia vera. — , ELEPHANT. 

 Acacia tomentosa. — , EVERGREEN. 

 Cratcegus Pyracantha. — , GLASTON- 

 BURY. Cratcegus Oxyacantha prcecox. 

 — , GOAT'S. Astragalus Tragacantha. — , 

 HAW. Cratcegits Oxyacantha. — , JERU- 

 SALEM. Parkinsonia aculcata. — , LILY. 

 Catesba?a spinosa. —, MOUSE. Centaurea 

 myacantha. — , ORANGE. Citriobatus. 

 — , SALLOW. Hippopha'e rhamnoides. 

 —, THIRSTY. Acacia Seyal. ^WASH- 

 INGTON. Cratcegus cordata. — , WHITE. 

 Cratcegus Oxyacantha; also Crataegus 

 punctata, the hardwood of whicli is used 

 in Canada for engraving. — , of West 

 Indies. Macromeriwm jamaicense. — , WIL- 

 LOW. Hippophae rhamnoides. 



THORN-APPLE. Datura Stramonium. 



THORN-BROOM. Ulex europ&us. 



THOROUGH-WAX, or THORO W-WAX. 



Bupleurum rotundifolium. 



THOROUGH WORT. Eupatorium per- 

 foliatum. 



THOTTEA. A tropical Asiatic shrub, 

 constituting a genus of Aristolochiacece. 

 The stem is wavy, jointed, swollen at the 

 joints ; the leaves entire ; the flowers very 

 large, in clusters opposite the leaves; the 

 perianth has a four-sided tube, which 

 expands above into a bell-shaped coloured 

 and three-cleft limb, downy within, and 

 somewhat prickly without ; the stamens 

 are from thirty to forty in number, adhe- 

 rent to a disk surmounting the ovary, 

 aud confluent with the style ; stigma de- 

 pressed, radiate ; fruit rod-like, quadran- 

 gular, two-celled. [M. T. M.] 



THOUINIA. Under this name was for- 

 merly included several genera belonging to 

 different natural orders, but it is now ex- 

 clusively applied to a genus of Sapindacece, 

 consisting of trees or shrubs, frequently 

 of climbing habit, and natives of Brazil 

 and of Tropical Australia. The leaves are 

 sometimes simple, but usually pinnate ; and 

 the flowers growin axillary racemes, occa- 



