1498 



HOLLYHOCK 



HOLODISCUS 



plants, means replanting in the spring to the proper 

 depth or the usual loss of the plant after one year's 

 bloom. 



Hollyhocks may be propagated in the spring by 

 placing a plant in sand so as to cover the crown of the 

 root which will cause a number of suckers to be sent 

 up about the crown, which may be removed and rooted. 



The hollyhock rust (Puccinia malvaceserum) bothers 

 very little in deeply dug and drained beds with plants 

 grown outdoors and planted with the tap-roots properly 



1845. Semi-double hollyhock. ( X 1 A) 



placed and the crowns in the proper place in reference to 

 the soil-surface. An appreciation of the deep-rooting, 

 drainage-liking habit and qualifications of the plant 

 will do more to combat this disease than any amount 

 of bordeaux mixture. In the United States Experi- 

 ment Station Record, Vol. XXXI, No. 3, note is made 

 from an article in a French publication (Compt. Rend. 

 Acad. Sci. 158, No. 6) which declares the hollyhock rust 

 to have been successfully combated during a three- 

 year trial by supplying as water to the roots a 3 per 

 cent solution of copper sulfate. 



In landscape work, the hollyhock best belongs to the 

 herbaceous perennial groupings, but it can be well 

 used alone in groups adjoining shrubbery, or in many 

 places in place of shrubbery. It can seldom be used to 

 advantage in mixture with woody plants, since the 

 hollyhock needs light on its lower basal leaves. Further, 

 the foliage of the hollyhock neither resembles nor con- 

 trasts well with that of the larger number of shrubs, 

 although there are exceptions, for example, hydrangeas 

 of the arborescens type and hollyhocks form a pleasing 

 mixture. F. W. BARCLAY. 



HOLLY, SEA: Eryngium. 



HOLMSKIOLDIA (Theodpr Holmskiold, 1732-1794, 

 Danish nobleman and scientist). Verbenacese. Shrubs, 

 one of which is offered, suitable for growing under glass. 



Leaves opposite, entire or dentate: fls. racemose or 

 cymose; calyx membranaceous and colored; corolla 

 cylindric and curved, the oblique limb with 5 short 

 lobes; stamens 4, didynamous, the anthers exserted: 

 fr. an obovoid drupe, 4-lobed, included in the enlarged 

 calyx. Probably 3 species, African and Asian. H. 

 sanguinea, Retz., is a straggling shrub 10-30 ft. high, 

 in the subtropical Himalayan region: Ivs. 3 in. long, 

 ovate, acuminate, entire or toothed: corolla 1 in. long, 

 brick-red to orange: drupe J^in. or less long, the calyx 

 1 in. diam. Offered abroad; an evergreen shrub. 



L. H. B. 



HOLODISCUS (Greek holos, entire, and discos; the 

 disk is entire). Syn., Schizonotus, Sericotheca. Rosacese. 

 Ornamental shrubs, cultivated for the showy panicles 

 of creamy white flowers. 



Deciduous, more or less pubescent: Ivs. alternate, 

 petioled, without stipules, incisely serrate or pinnately 



lobed: fls. in terminal panicles, perfect; calyx cup- 

 shaped, 5-lobed; petals 5; stamens about 20; ovaries 

 5, surrounded by an entire disk, developing into 5 

 distinct, pubescent, 1-seeded achenes. Formerly usu- 

 ally referred to Spiraa, but more nearly related to 

 Exochorda. About 14 closely related species ranging 

 from Brit. Col. through Mex. to Colombia, and east 

 to Idaho, Colo, and New Mex., have been distinguished; 

 by some botanists they are reduced to 5 or even to 

 only 2 species. 



These are ornamental free-flowering shrubs with 

 rather small dull green foliage and small, whitish 

 flowers in ample showy panicles: fruit insignificant. 

 H. discolor is a very graceful plant, with its drooping 

 feathery panicles of creamy white flowers, and well 

 adapted for borders of shrubberies or for single speci- 

 mens on the lawn; it is hardy in favorable localities as 

 far north as Massachusetts. They grow in almost any 

 well-drained soil, and do best in a sunny position. 

 Propagation is by seeds usually sown in boxes in fall 

 and only slightly covered with soil, or by layers; some- 

 times also increased by greenwood cuttings under glass 

 taken with a heel, but usually only a small percentage of 

 them take root. 



discolor, Maxim. (Spirsea discolor, Pursh. Serico- 

 theca discolor, Rydb.). Fig. 1846. Shrub, to 20 ft., with 

 slender, arching branches: Ivs. ovate or oblong, trun- 

 cate or narrowed at the base, pinnately lobed, lobes 

 dentate or nearly entire, usually glabrous above, 

 pubescent or tomentose beneath, J^-3 in. long: fls. 

 creamy white, small, in ample drooping panicles 3-9 

 in. long. July. Brit. Col. to Calif., east to Idaho and 

 Mont. Gn. 45, p. 56; 47, p. 188; 49, p. 104; 50, p. 278; 

 63, p. 195; 74, p. 41; 76, p. 556. G.C. III. 25:21; 32: 

 suppl. Oct. 11. G.W. 8, p. 302. G.F. 4:617. G. 25: 

 363. B.R. 1365. R.H. 1906, p. 440. The typical 

 form has the Ivs. 

 whitish tomentose 

 below; var. ariae- 

 folius, Aschers. 

 & Graebn. (Spi- 

 raea arisefplia, 

 Sm.), which is the 

 commonly cult, 

 form, has the Ivs. 

 grayish green and 

 pubescent below. 



dumdsus, 

 Heller (H . 

 discolor var. 

 dumdsus, ^ 

 D i p p . Spi- f 

 rssa dumdsa, 

 Nutt. H. australis, 

 Heller). Erect shrub, 

 8 ft. high: Ivs. obovate, 

 acute or obtuse, 

 cuneate at the base, 

 coarsely toothed, pu- 

 bescent above, whitish- 

 tomentose beneath, 1-2 

 in. long: panicle ovoid 

 or conic, 2-7 in. long, 

 with ascending or 

 spreading branches. 

 Wyo. and Utah to 

 New Mex. and Mex. 

 Bull. TorreyBot. Club. 

 25:338. 



H. Boursieri, Rehd. (Spirsea 

 Boursieri, Carr. Sericotheca 

 Boursieri, Rydb.). Allied to H. 

 dumosus, but Ivs. flabellate or 

 roundish, smaller and infl. usually 

 simple or sparingly branched, 2-3 

 in. long. Calif. R.H. 1859, p. 



1846. Holodiscus discolor. 



519. 



ALFRED REHDER. 



