3334 



THRINAX 



THUJA 



AA. Under surface of Ivs. silvery or glaucous. 



B. Lf.-segms. connivent at base. 



argentea, Lodd. (Coccothrinax argentea, Schum.). 

 Caudex 12-15 ft. high, 2-3 in. thick: Ivs. shorter than 

 the petiole, silvery gray beneath, making one of the 

 most beautiful effects in all the palms; segms. united at 

 the base; ligule concave, semi-lunar, erose. W. Indies. 



BB. Lf.-segms. connivent for one-third their length. 

 excelsa, Lodd. Lvs. pale green above, hoary-glau- 

 cous beneath; segms. united one-third; ligule bluntly 

 deltoid; sheath densely buff-lanate. Jamaica, British 

 Guiana. Held by some to be a form of the preceding. 



BBB. Lf.-segms. connivent for one-half their length. 

 multiflora, Mart. (T. graminifolia, Hort.). St. 

 medium, 6-8 ft. high: sheaths ragged, fibrous, irregu- 

 larly reticulate, tomentose: young Ivs. white woofiy- 

 tomentose; blade equaling the petiole, laciniate; segms. 

 united one-half their length, ensiform-acuminate, 

 rather strict* glaucous beneath; ligule transversely 

 oblong, sinuate, 3-lobed. Haiti. I.H. 31:542. 



Other species of Thrinax are in cult, in private collections (see 

 p. 2446), but it is doubtful whether they are in the trade. Some of 

 them may be listed as Coccothrinax. T. altlssima, Hort. Lvs. 

 large, 4}^ ft. diam., nearly orbicular, the upper lobe of the base 

 folding over the lower one some 7 or 8 segms., rich glossy green 

 above, brilliant silvery beneath, with about 58 segms. which reach 

 over one-third of the way to the base; ligule deep buff-orange, 

 subreniform, open at base; a small basal area of the If. orange- 

 tinted; petioles 4}^ ft. long, biconvex, slightly channeled above, 

 bases included in a closely woven network of strong fiber, greenish 

 yellow, the fiber ashy brown. Grows with vigor in Fla., on ordi- 

 nary pineland. The botanical position of this palm is undetermined. 

 T. argentea, Chapm. =Coccothrinax. T. C7iuco=Acanthorrhiza 

 Chuco. T. crinita, Griseb. & Wendl. Cuban. A moderate-sized 

 palm with Ivs. about 3 ft. diam., and with a short, stiff ligule. Proba- 

 bly belongs, according to Beccari, somewhere near Coccothrinax 

 argentea. This palm was lost to science for 60 years and has 

 recently been rediscovered. A specimen growing in the Brooklyn 

 Botanic Garden has the trunk covered with a fibrous hair-like 

 growth, unlike any W. Indian palms known. T. elegantissima, 

 Hort., seems to be unknown to botanists. It may be T. elegans 

 which probably belongs to T. radiata. T. floridana, Sarg. A slen- 

 der tree, to 30 ft. : If .-blades 34 ft. across, yellowish green, shining 

 above: spadix 3-4 ft. long: fls. slender-pedicelled, the sepals and 

 petals united; filaments subulate: fr. small, J^in. diam. or less. 

 Fla. and Keys. T. Gdrberi, Chapm. =Coccothrinax. T. keyensis, 

 Sarg. Rather stout, 25 ft., the trunk on a base of matted roots: lf.- 

 blades 31 ft. across, yellowish green above: spadix 6 ft. or so 

 long: fls. on short disk-like pedicels, and sepals and petals only 

 partly united; filaments triangular: fr. }^in. or less thick. Lower 

 Keys. T. microcdrpa, Sarg. Tree, 30 ft. or more: If. -blades 3-4 

 ft. broad, pale green above and silvery white beneath: spadix 1-2 

 ft. long: fls. on disk-like pedicels, the sepals and petals only parti- 

 ally united; filaments triangular: fr. very small, only J^in. or less 

 thick. Keys of Fla. T. Morrisii, Wendl. One to 2^ ft. high: Ivs. 

 glaucescent beneath; segms. free for about two-thirds or three- 

 fourths their length. G.C. III. 11:113; 30:353. Anguilla. T. 

 Wendlandiana, Becc. Lys. flabellate-orbicular, paler beneath; 

 segms. linear-oblong: spadix elongated: fls. long-pedicelled. Cuba 

 and Honduras. N TAYLOR . t 



THRIXSPERMUM (Greek, hair and seed, referring 

 to the hair-shaped seeds). Syn., Sarcochllus. Orchi- 

 dacese. Epiphytic non-pseudobulbous orchids, grown 

 for their bloom in the warmhouse. 



Stems short, either covered with prominent per- 

 sistent truncate bases of the Ivs. or leafless: Ivs. flat 

 and often falcate, or narrow-linear, or none: racemes 

 axillary; bracts small; sepals and petals nearly equal, 

 free, spreading, the lateral sepals often more or less 

 dilated at the base; labellum articulate at the end of the 

 basal projection of the column, 3-lobed; column short, 

 erect, produced at the base ; pollen-masses 4 : caps, usu- 

 ally linear or narrow-oblong. Species 30, Old World. 



Cecfliae, Reichb. f. (Sarcochilus Cecilix, F. Muell.). 

 Sts. short, sometimes elongated to 2-3 in.: Ivs. linear or 

 narrowly linear-lanceolate, thick, 2-3 in. long: racemes 

 up to 6-8 in. long, erect, bearing above the middle 

 several small short-pedicelled pink fls.; lateral sepals 

 almost ovate, dorsal sepal narrower; petals still nar- 

 rower; labellum shorter than the sepals. Austral. 



Hartmannii, Reichb. f. (Sarcochilus Hdrtmannii, F. 

 Muell.). Sts. short: Ivs. fleshy, 3-5 in. long: scapes 



erect: fls. rather small; sepals and petals white, spotted 

 basally with red; labellum shorter, saccate, white, 

 streaked with red-purple. Queensland. G. 32:337. 



lilacinum, Reichb. f. (Sarcochilus lildcinus, Griff.). 

 Climbing: sts. slender, 2-3 ft. high: Ivs. alternate, ovate, 

 pale green, l}^-2 in. long, cordate and amplexicaul at 

 the base: raceme 1-8 in. long; rachis very stout, com- 

 pressed, few- to many-fld. : fls. pale rose, white-lilac or 

 bluish, very short-pedicelled; sepals and petals broadly 

 ovate; labellum saccate, white, yellowish and pubes- 

 cent within: caps. 4-6 in. long, linear. Malaya. B.M. 

 7754. p. TRACY HUBBARD. 



THRYALLIS (old Greek name, transferred to 

 these plants). Malpighidcese. Confusion in practice 

 has arisen in the application of this name and Gal- 

 phimia. As expressed by J. N. Rose, "the genus 

 Thryallis was published by Linna?us in the second 

 edition of his Species Plantarum, basing it upon a 

 single species, T. brasiliensis. In 1829 Martius described 

 two additional species, T. longifolia and T. latifolia. 

 These two species, however, were soon found not to be 

 congeneric with the original species, but instead of 

 being taken out as a new generic type, were allowed to 

 remain as Thryallis, while the true type of that genus 

 was transferred to Galphimia." Kuntze gave the name 

 Hemsleyna to the two plants of Martius. If Thryallis 

 is restored to its original application, with its legiti- 

 mate extension, then the plants described under Gal- 

 phimia, page 1312, become T. brasiliensis, Linn. (G. 

 brasiliensis, Juss.); T. hirsuta, Kuntze (G. hirsuta, 

 Cav.); T. glauca, Kuntze (G. glauca, Cav.). There is a 

 native species, T. angustifolia, Kuntze (G. angusti- 

 folia, Benth.), in Texas and adjacent Mexico, 1 to 2% 

 feet tall, more or less woody at base, with linear to 

 lanceolate leaves and petals yellow turning reddish. 



THRYPTOMENE (Greek word said to refer to the 

 low heath-like appearance of the plant). Myrtaceae. 

 Glabrous heath-like shrubs, which were at one time 

 popular greenhouse plants, now apparently not so com- 

 monly in cult. Lvs. opposite, small, entire: fls. small, 

 sessile or pedicelled, solitary at the axils or rarely fas- 

 ciculate; bracteoles 2; calyx-tube hemispherical, turbi- 

 nate or short-campanulate limb with 5 petaloid or 

 scarious, entire, spreading segms.; petals 5, persistent, 

 usually connivent above the genital organs; stamens 10; 

 ovary inferior, 1-celled: fr. sometimes 1-seeded, inde- 

 hiscent, sometimes 2-seeded and spuriously 2-berried. 

 About 25 species, Austral. 



Mitchelliana, F. Muell. A compact, bushy shrub with 

 slender branches: Ivs. oblong, flat, J^-^in. long: fls. 

 in the upper axils solitary or in clusters of 2 or 3, white. 

 Offered in S. Calif .Intro, by Mrs. T. B. Shepherd, who 

 says the plant rarely exceeds 4 ft. in height, blooms in 

 midwinter and is good for cut-fls. 



F. TRACY HUBBARD. f 



THUJA (Thy a or Thyia, an ancient Greek name for 

 a resinous tree or shrub). Also spelled Thuya or Thuia. 

 Including Biota. Pinacese. ARBOR-VIT.E. Ornamental 

 woody plants, grown for their handsome evergreen 

 foliage and formal habit. 



Resiniferous trees with short horizontal much rami- 

 fied branches; the flattened branchlets arranged frond- 

 like: Ivs. decussate, scale-like, appressed, usually glan- 

 dular on the back: fls. monoecious, globose, small, 

 terminal on short branchlets, staminate yellow and 

 consisting of usually 6 opposite stamens each with 2-4 

 anther-cells; pistillate consisting of 8-12 scales in 

 opposite pairs, of which only the middle ones, or in the 

 section Biota the lower ones, are fertile, each scale with 

 2 ovules inside at the base: strobiles globose-ovate to 

 oval-oblong, with 2 seeds under the fertile scales. 

 Five species occur in N. Amer., E. and Cent. Asia. 

 The wood is light and soft, brittle and rather coarse- 



