344 TILIACE.E. Tllia. 



Var. leptoph^lla, Vent. 1. c. ll. Leaves larger (sometimes equalling those of T. 

 Americuiut) ;uul membrauaceous. — Torr. & Gray, 1. c. — S. Caroliuato Texas. 



T. heterophylla, Vknt. Large tree : leaves ample (ofteuer 6 or 8 inclie.sloiig and of ovate 

 (lutliiie), glabrous and sliiuing above, whitish aud when young cauesceut-puberulent and sil- 

 very beneatli : floral bract tapering to short-stalked or subsessile base ; this and especially 

 the peduncle elongated : fruit globular, not costate or lineate. — Anal. Hist. Nat. Madrid, ii. 

 68 (1800), & Monogr. Til. (Mem. de ITnst. class 1, iv.) 16, t. 5 ; Torr. & Gray, 1. c. 239; Nutt. 

 Sylv. i. 90, t. 23. T. aJha, Michx. f. Hist. Arb. Am. iii. 315, t. 2, not Ait. T. laxijiora, 

 Pursh, Fl. i. 363, not Michx. T. Americana, var. heterophi/l/a, Loud. 1. c. 375, t. 23. — Along 

 tiie Allegiianies from S. Peun.sylvania to Florida, west to S. Illinois and Tennessee. 

 T. ALUA, Ait. {T. rotundifolia, Vent.), is the Hungarian T. argentea, by mistake credited to 



N. America. 



Order XXIX. LINACEiE. 



By W. Trelease. 



Herbaceous or suffrutescent terrestrial plants (in our region). Leaves soon 

 alternate, only exceptionally opposite or in whorls of 3, sessile or nearly so, 

 simple, entire except sometimes the uppermost, with or without stipules or their 

 equivalents. Flowers racemose or in more or less open subpanicled cymes, often 

 small but commonly showy, variously colored, perfect, mostly 5-merous, hypo- 

 gynous, without a disk. Glands of the receptacle 5, small, opposite the sepals, 

 which are mostly distinct, imbricate, often glandular-toothed. Stamens as many 

 as the petals and alternate with them, slightly monadelphous at base, persistent ; 

 anthers oblong, introrse, more or less versatile, 2-celled, with longitudinal dehis- 

 cence. Carpels and styles 2 to 5 ; ovary slightly 4-10-lobed, its cells equal in 

 number to the styles or twice as many from the intrusion of a false septum from 

 the back of each cell, the true cells 2-ovuled, Seeds oily, with a little albumen ; 

 embryo usually straight, with plane cotyledons. 



1. LINUM, Tourn. Flax, (Ancient classical name,) — Flowers 5-merous, 

 symmetrical except that in HesperoUnon the carpels are reduced in number. Sepals 

 mostly persistent. Capsules splitting through the false septa and also septicidal 

 in most species. Stipules replaced by small glands, or wanting. — Inst, 339, t, 

 176; L. Gen, no. 254; Torr. & Gray, Fl. i. 204, 678 ; Planch, Lond. Jour. Bot. 

 vi. 593, vii. 165, 473, 507 ; Gray, Gen. 111. ii. 107, t. 143, Proc. Am. Acad, vi. 

 521, & vii. 333; Engelm, in Gray, PI, Wright, i. 25; Benth. & Hook. Gen, i. 

 242 ; Baill. Hist. PI. v, 63 ; Brew, & Wats. Bot. Calif, i, 89, ii. 438 ; Trelease, 

 Trans, St. Louis Acad. v. 7, t. 34 ; Reiche in Engl. & Prantl, Nat. Pflanzenf. iii. 

 Ab. 4, 30. — Chiefly of the temperate regions of both hemispheres. 



* Exstipulate : leaves and bracts entire, alternate : pedicels elongated : flowers large, blue 

 (though all)inos sometimes occur) : sepals not glandular-margined, persistent : petals not 

 appendaged : filaments with slender intervening appendages : carpels 5, not cartilaginous 

 at base ; styles distinct : capsule large (3 or 4 lines long), with membranous septa, the 

 half carpels somewhat longitudinally hollowed and 2-grooved on tlie back ; false septa in- 

 complete ; seeds compressed, 2 to 3 lines long : bluish glabrous plants a foot or two high. 

 — § Eulinum. 



