OXOCLEA 



they prefer a moist, rather heavy loam, in a cool but 

 not' necessarily shaded position. O. Struthiopteris {a. 

 MiMeuccin) in the sunny border is likely to burn 

 during severe drought. It is a suitable deciduous fern 

 for the greenhouse, and may easily be had in foliage 

 before their natural season. y. W. B.irclat. 



1539. Sensitive-fern— Onodea sensibilis. 

 Fruiting frond at A. 



ONONIS (old Greek name of dubious meaning). 

 Jjfi/iitnhws'.f. Kest-Harkow. About 60 species of half- 

 shrubby or rarely shrubby herbs, natives of the Medi- 

 terranean countries, annual, biennial or perennial. Lvs. 

 usually pinnately trifoliolate, the stipules attached to the 

 petiole: fls. yellow, purple, pink or rarely white, soli- 

 tary, 2-3 in the axils or in peduncled racemes ; caly.x 

 bell-shaped, 5-parted, deeply cut, narrow ; standard 

 large, striped; stamens united in a tribe, the members 

 sometimes p.irtly free; pedicel awn-like: pod usually 

 swollen, few-seeded, without foot-stalk. 



A. Fls. in groups of 2-S, rose-colored. 



rotundifolia, Linn. Round-leaved Rest-Harrow. A 

 m-at. .■itira,-ti\ .-. NliruMiV, liMivly |.hint 1 ' .j ft. high. Lvs. 

 trifi'lh'liiir : 111- ^uKi-mIuihI lo M\ :iir, vri-rari-: peduncles 

 axilhiiN ; r:vruv- ■_'-:; ll-. : II^. |i.-:i-likr. l.rii;lit rose, not 

 brai-Tftl ; stiiiniard >tn]u-.l wiiii jiin-s uf ;i lit-eper shade. 

 Of easy cultivation in Ijorder and rockery, not liking 

 too much shade. Prop, by division or seed. Summer. 

 B.M. 335. 



AA. Fls. solitary, yellow. 



Nitrix, Linn. Goat Rckit. Vf.lli>\v-flo\vkked Ukst- 

 Harrow. Low. nim-li-liriUM-lir.l p.-nnuial: ^i.m l-I'.j 

 ft. high: lvs. trifolinliLi,.; Ifiv, ,01-i]iii.'al >.i- .,M.,ii-, s,t- 



rated near the apex or ^o timi'. t-ntiro: stipuLv laiire; 



fls. axillary, the standard liucly striped with red. Mi.i- 

 summer to fall. B.il. 329. jj. b. Coulstox. 



0N0P6ED0N (ancient Greek name). CompSsilce. 

 The Scotch Thistle, O. Acantliium, is a vigorous bien- 

 nial plant, growing 5-7 ft. high, with cottony white, 

 spiny foliage, and heads of pale purple fls. lJ^-2 in. 

 across, borne singly on the branches. It is not adver- 

 tised for sale in America, but is sometimes cultivated 



for "auld lang syne," and o isioiially it is used with 



striking effect by some lu\-.r of liar.ly ]. hints. It is 



then placed against a backiri'ouii'i ot <lai-k shrubbery, 



which sets off the silverv foliaL"- ainl Ih.M habit of the 



Scotch Thistle. Tb.. [.laiit i~ rar.U 



in the Atlalilir Slatr.. ila^iIlL' ■■„„< 



Scotch TlliMl,' will |i|Mli:il.l> l|.'\. 



first importanrr in \in. rna, a- i- 



Nevertheless, i-arc slioul.l !"■ laktii not to let it go to 



seed. A white-fld. .Scotch Thistle was advertised in 



Germany in 1894 as a horticultural novelty. 



Onopordon is a genus of about 12 species of coarse, 

 woolly. Old World herbs, with stout stems winged by 



rowing wild 

 iiirope. The 

 .v.ed of the 

 a.ia Thistle. 



ONOSMODIUM 1141 



large, alter- 



ivolucre glo- 



ited in many series, and in some 



I- flat, fleshy, honeycombed, not 



iimose, but with bristles in sev- 



Acanthium, Linn. Scotch Thistle. Much-branched, 

 .3-9 ft. hish: lvs. oblong, lobed and dentate, acute, the 

 lower often 1 ft. long. July-Sept. B.B. 3:491. Gn. 46, 

 p. 9. R.B. 20, p. 200. Var. 41ba, Hort. Gt. 45, p. 107.- 

 The Scotch Thistle is often called the Cotton Thistle: 

 sometimes also Argentine, Asses', Down, Oat, Queen 

 .Mary's or Silver Thistle. w_ jj 



ONOSHA {onos, an ass, and osme, smell ; the odor 

 reputed to be liked by that animal). Borragin&cete. 

 .\bout 70 species of bristly hardy herbs or undershrubs, 

 with long, narrow, alternate lvs. and one-sided, simple ' 

 or cymose, bracted racemes: the fls. yellow or purple, 

 tube-like, or inflated on one side, sessile, or with short 

 pedicel; calyx 5-parted or cut; corolla-throat dilated or 

 contracted; lobes 5, very short ; stamens 5. 



stellumtum, Waldst. & Kit. Golden - Drop. Cult. 

 only in var. TaiUicuin (O. Tahricum. Pall.). Stems 

 l.ranrhirm' from ground : lvs. linear-lanceolate, with 

 nvolut.- .-.l^'es: scape branching, leaning, 6-9 in. high; 

 racfiiM- 1. rininal, jit-ndulous : fls. yellow, tubular, ex- 

 paniliii: .' .' - 1 ■ in a raceme, IJ^ in. long. July, Aug. 



Pert-ni s |. \xq\i on high ground or on sunny 



rocki 1 lit I I . "pen, deep soil. Prop, by cuttings 



gencialt . I I , i.ii. B.M. 889. G.C. II. 16:21. J.H. 

 III. 3.-,:ll. cin. .-(I, p. 251. 



J. B. Keller and M. B. Coulston. 



ONOSMODIUM (like Onosma, a European genus of 

 this family). Jinrriiginacea'. False Gromwell. Five 

 or 6 species of North American and Mexican branching 

 herbs, generally perennial, bristly, 1-4 ft. high. Lvs. 

 oblong, sessile, ribbed-veined : fls. white, greenish or 

 yellowish, in long, erect, leafy, raceme-like clusters ; 

 corolla tubular or oblong-funnel-shaped, with throat 

 naked, the lobes erect, acute: the .sinuses more or less 

 intlcxc.l; style filiform or capillary, very long; stigma 



to L th I ern m 



Carolini&num, Torr. Stout, branched, 1-3 ft. : lvs. 

 ovate-lanceolate or oblong-ovate, sessile, 5-9-ribbed, 2-4 

 in. long: fls. yellowish white. June. Can. and western 

 N. Y., west and southward. — Offered by western dealers 

 in hardy plants. Prop, by seeds. ji. g. Coulston. 



