41'2 TRILLIUM, USNEA. 



of the calyx setaceous, longer than the corolla ; leafets viltoee, narrow obo- 

 vate ; banner deciduous. 6 12 i. S. 



63. TRILLIUM. 11. 12. 



pen"dulum (noddding wake robin, w. M. 4), peduncles erect, with the flower 

 a little nodding ; petals ovate, shortly acuminate, spreading, flat, longer than 

 the calyx; leaves rhomboid acuminate, sessile. 



crec"tum (false wake robin. O. p. w-y. 31. 4), peduncles erect or crectish, with 

 the flowers a little nodding; petals ovate, acuminate, spreading; equalling 

 the calyx ; leaves rhomboid, acuminate, sessile Var. atropurpttreum, petals 

 large, dark purple. Var. album, petals smaller, white ; germ red. Var. fla- 

 rum, petals yellow; both petals and calyx leaves longer and narrower. 12- 

 to 18 inches high- Leaves often 3 to 4 inches broad. Peduncles about 3 

 inches long. 9 16 i. S. 



32. TRITICUM. 4. 10. 

 Exotic. 



hyber"num (winter wheat J. ), calyx glume 4 flowered, tumid, even, imbri- 

 cate, abrupt, with a short compressed point ; stipule jagged ; corollas of the 

 upper florets somewhat bearded. -There are several varieties of this species 

 which are introduced by culture. 



81. TROP^OLUM. 23. 73. 



Exotic. 



ma'jus (nasturtion, indian cress, y. & r. Ju. & 4), leaves peltate, sub-repand ; 

 petals obtuse, some of them fringed. 



61. TULIPA. 10. 14. 



Exotic. 

 waWofcn* (sweet tulip. M. 4), small stem 1 flowered, pubescent ; flower erect; 



petals obtuse, glabrous ; leaves lance-ovate. 



gesneria'na (common tulip. M. 4), stem 1 flowered, glabrous : flower various 

 coloured, erect ; petals obtuse, glabrous ; leaves lance ovate. 



172. TUSSILAGO. 49. 55., 



far"fara (colt's foot: y. Ap. 4), scape single flowered, scaly ; leaves cordate, 

 angular, toothed downy beneath. The flower appears long before the leaves. 



193. TYPHA! 3. a 



latifo'lia (cat tail, reed mace. O. Ju. 4), leaves linear, flat, slightly convex be- 

 neath ; staminate and pistillate nmrnts close together. Wet. 46 S. 

 52. ULMUS. 53. 99. 



america'na (elm, white elm. O. g-p. Ap. > ), branches smooth ; leaves oblique 

 at the base, having acuminate serratures a little hooking ; flowers pedicelled ; 

 fruit fringed with dense down. Var. pendula, has hanging branches and 

 smoothish leaves. 40 70 f. 5. 



214. ULVA. 57. 2. 



lin"za, frond lance linear ; margin undulate crisped. About an inch broad, ta- 

 pering td the base, green. Sea shore. 



52. URASPERMUM. 45. 60. 



clayto'ni (sweet cicely. O. J. 4), leaves compound, hairy ; leafets gash toothed ; 



umbels axillary and terminal, about 5 rayed ; style as long as the villose 



germ, filiform, deflected. 2 f. 



216. UREDO. 58. 1. 

 linea'ris (yellow grain rust. J. ), linear, very long, stained yellow, at length 



but obscurely coloured. On the culms and leaves of barley, oats, rye, 



wheat, &c. 



19_4. URTICA, 53. 99. 

 dio'ica (common nettle. O J. 4), leaves opposite, cordate, lance ovate, coarsely 



serate ; flowers dioecious ; spikes panicled, glomerate, in pairs, longer than 



the petioles. 23 f. 5. 



215. USNEA. 57. 2. 



plica'ta, frond pendulous, smooth, pale ; branches lax, very branching, sub- 

 fibrous ; the extreme ones capillary ; receptacles flat, broad, ciliate ; the 

 cilise very slender and long. On trunks and branches of trees ; most com.- 



