Cneoridium. 



RUTACEif:. 



1. PTELEA, Linn. Iloi 



li7 



I owers polygauioM.s. Sq.als, pntals, and stamens 4 or 5. Ovary with a short 

 thick stipe, 2-celled ; cell.. 2-ovulcd, the lower ovule abortive : style short. Fruit a 

 broadly winged orbicular samara, 2-ceHed and 2-seeded ; the wing embracing a slen- 

 der Btipo. So,.,l8 oblong. Kinbryo straight, with ovato-oblong cotyledons _ 

 Shrubs or small trees; leaves mostly trifoliolate, with sessile leallets ; llowers small, 

 groenish-whito, in terminal cymes or compound corymbs. 



A genus of linlfa dozon species, confined to the United States un.l Mexico. 



n„!l;f^;?^.''^*l^°.^f'^T;^'' Ashn,b5 to 25 feet high, with chestnut-colored 

 punctate bark : leallcts oblong-lanceolate, somewhat rhomboidal, 1 to 2h inches 

 ong, usually acute or acuminate, entire, sparingly pubescent, l)ecoming smooth and 

 t^T'^.''f\' 9^''\r'''^ ""'"^^""'Y "' compound corymbs, pubescent: sepals 

 small : petals 2 or 3 hues long, spreading : fruit 6 to 8 lines broad, emarginat^ at 



rCir"4 ^ ^^'^'^ "''"'''''' ^ ^° ^ ^""'' long.— J>1. Ilartw. 9; Gray, PI. 



on. / tyifohntaon\xe Atlantic SUtes in its narrower nnd sn.nller l.-avcs, larRer flowers morl 



.IThf ;rb "? ['■"? ;"^"''g*'"^te at base, an.l sliorter narrower sti,.o. Is olor nometimS 



^.n^'bilLt'ofcrlhed:^"" ''"""■"^' ^""'^^^'"^^ unpleasantly ra.lk. most frag,.nt when tlS 



2. THAMNOSMA, Ton. 

 Sepals 4. Petals 4, erect. Stamens 8, at the ],ase of a cup-shupod crenate or 

 lobed disk. Ovary stipitate, 2-lobcd and 2-colled, with 5 or G ovules in each cell • 

 sty e elongated. Capsule didymous, coriaceous, dehiscent down the inner edye of 

 each lobe. Seeds 4 to G in each cell, reniform. Embryo curved, terete. -Low 

 glandular desert shrubs, strongly scented; leaves simple and linear, alternate- 

 flowers purple or yellow, solitary. The following are the only species. 



1. T. montaiium, Torr. A smooth diffusely and stiniy branched shrub son.fi- 

 wha sp.nose, a foot or two high, with yellowish-green bark : ]e"es c tt^red 4 tt 

 12 n..s long, soon deciduous: pe-luncles axillary, 1 t,. 4 lines long, with several 

 snial bracts: calyx short: petals 4 or 5 lines h.ng, nearly closed, a^.tlv 

 purple : capsule yellow, of two sul)globose nearly disiiuct cells, three liif^ on^ 

 stipo about a line long. -Frem. Pej.. 313; J>acif P. Pep iv 7.3 t 3 

 UtSj'mthermr """''" "'•''" ''^^^' '™"' ^'"'^ ^^"•''^ ^o Fort Mol.av; and eastward to S. 

 T. TEXANU.M, Torr. (Rulosma, Tcxanum, Gray Gen 111 ii 144 t in<;\ w ^ , . 



3. CNEORIDIUM, Monk. f. 

 Sepal.s, petals, and stanx-ns 4, or .stamens sometimes 8, the alternate one^ much 

 shorter. Disk annular, obtu.sely 8-angle.l. Ovary globo.se, .sessile, of a single 



r4ir- 



pel l-celled, 2-ovule.l : style latend, curve.l, short. Fruit " dru,,aceous," 1-2- 

 see<led. Seed globo.se, with fleshy albumen : embryo curved. - A low smooth 

 shrub; leaves opposite, linear-spatulate, entire; flowers small, axillary an.l solitary 

 or somewhat corymbose, on short bracted peduncle.s. A single species. 



1. C.dumosum^^Hook f Heavy-scented, much-branrh.-d. 2 to 4 feet high, 

 leafy: leaves often fnscicled. h in I A inches long, namnv : iL.wers white, 2 t^ 3 



