ONOCLEA 



ONOSMODIUM 



1141 



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

 not necessarily shaded position. O. Struthiopteris (a 

 Matteuccia) 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. p\ \V. BARCLAY. 



1539. Sensitive-fern Onoclea sensibilis. 

 Fruiting frond at A. 



ONONIS (old Greek name of dubious meaning). 

 Leguminosce . REST-HARROW. 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 ; calyx 

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

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

 sometimes partly free; pedicel awn-like: pod usually 

 swollen, few-seeded, without foot-stalk. 



A. Fls. in groups of 2-3, rose-colored. 



rotundifolia, Linn. ROUND-LEAVED REST-HARROW. A 

 neat, attractive, shrubby, hardy plant 1% ft. high. Lvs. 

 trifoliolate; If ts. subrotund to ovate, serrate: peduncles 

 axillary: racemes 2-3 fls. : fls. pea-like, bright rose, not 

 bracted ; standard striped with lines of a deeper shade. 

 Of easy cultivation in border and rockery, not liking 

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

 B.M. 335. 



AA. Fls. solitary, yellow. 



Natrix, Linn. GOAT ROOT. YELLOW-FLOWERED REST- 

 HARROW. Low, much -branched perennial: stem 1-1 K 

 ft. high: Ivs. trifoliolate; Ifts. elliptical or oblong, ser- 

 rated near the apex or sometimes entire ; stipules large : 

 fls. axillary, the standard finely striped with red. Mid- 

 summer to fall. B.M. 329. M. B. COULSTON. 



ONOPORDON (ancient Greek name). Compdsitw. 

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

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

 spiny foliage, and heads of pale purple fls. l%-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 occasionally it is used with 

 striking effect by some lover of hardy plants. It is 

 then placed against a background of dark shrubbery, 

 which sets off the silvery foliage and bold habit of the 

 Scotch Thistle. The plant is rarely found growing wild 

 in the Atlantic States, having come from Europe. The 

 Scotch Thistle will probably never be a weed of the 

 first importance in America, as is the Canada Thistle. 

 Nevertheless, care should be taken not to let it go to 

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

 Germany in 1894 as a horticultural novelty. 



Onopo'rdon is a genus of about 12 species of coarse, 

 woolly, Old World herbs, with stout stems winged by 



the decurrent bases of the Ivs., which are large, alter- 

 nate, prickly, dentate or pinnately cut: involucre glo- 

 bose, the bracts imbricated in many series, and in some 

 cases spiny: receptacle flat, fleshy, honeycombed, not 

 bristly: pappus not plumose, but with bristles in sev- 

 eral series. 



Acanthium, Linn. SCOTCH THISTLE. Much-branched, 

 3-9 ft. high: Ivs. 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. Alba, 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. ^ j^j 



ON6SMA (onos, an ass, and osme, smell ; the odor 

 reputed to be liked by that animal). Borra.gind.ceoe. 

 About 70 species of bristly hardy herbs or undershrubs, 

 with long, narrow, alternate Ivs. 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. 



stellulatum, Waldst. & Kit. GOLDEN - DROP. Cult, 

 only in var. Tauricum (O. Tauricum, Pall.). Stems 

 branching from ground : Ivs. linear-lanceolate, with 

 revolute edges; scape branching, leaning, 6-9 in. high; 

 raceme terminal, pendulous : fls. yellow, tubular, ex- 

 panding above, 8-12 in a raceme, 1% in. long. July, Aug. 

 Perennial. Succeeds well on high ground or on sunny 

 rockery, with light, open, deep soil. Prop, by cuttings 

 generally, or by seed. B.M. 889. G.C. II. 16:21. J.H. 

 III. 35:11. Gn. 50, p. 251. 



J. B. KELLER and M. B. COULSTON. 



ONOSMODIUM (like Onosma, a European genus of 

 this family). Borraginacece. 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 

 inflexed; style filiform or capillary, very long; stigma 



1540. Onychium Japonicum. 



(XM-) 



Showing fertile and sterile fronds. 

 (See Onychium, p. 1142.) 



exserted before the corolla opens : nutlets ovoid or globu- 

 lar, bony, smooth and polished, white. Closely related 

 to Lithosperraum. 



Carolinianum, Torr. Stout, branched, 1-3 ft. : Ivs. 

 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. M. B. COULSTON. 



