Polemonium caeruleum
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| Exposure: | ☼ | ?"?" is not in the list (sun, part-sun, shade, unknown) of allowed values for the "Exposure" property. |
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| Water: | ◍ | ?"?" is not in the list (wet, moist, moderate, dry, less when dormant) of allowed values for the "Water" property. |
Read about Polemonium caeruleum in the Standard Cyclopedia of Horticulture
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Polemonium caeruleum, Linn. Jacob's Ladder. Charity. Fig. 3092. Stout perennial herb, erect and leafy, 1 -3 ft.: st. lightly hairy or nearly smooth, more or less glandular, angled: radical lvs. forming dense tufts, on petioles 6 in. or more long, the lfts. 11-21, lanceolate and mostly acuminate, entire; st.-lvs. smaller, very short-petioled or sessile near top of st.: fls. blue, many drooping in a panicle (frs. erect), 1 in. or less diam., the stamens not exserted; style protruded; corolla-lobes broad and spreading, subacute or mucronulate : calyx campanulate, with oblong acute lobes: caps, included in the calyx. Eu., mostly in copses and along streams, in moist or wet ground. Var. album, Hort. (P. album, Hort,), with white fls., is almost as popular as the type. Var. variegatum, Hort., has variegated foliage. There is also a dwarf form. P. caeruleum is widespread and variable, and the geographic forms are sometimes set off as species. Var. himalaya- mim, Baker (P. himalayanum, Baker. P. grandi- florum, Hort., not Benth. P. caeruleum var. grandi- florum, J. W. Manning), is the Himalayan form, with large fls. 1 1/2 in. across, lilac-blue or darker, the rounded lobes nearly 1/2 in. across; calyx and axis of panicle very hairy. In separating the American forms, much is made of the character of the root- stock. Greene, who has studied them, describes the true P. caeruleum of Eu. and of gardens as having a tap-root surmounted by a stout short simple or branching very leafy crown standing above ground. Hooker, however, speaks of the rootstock as short, creeping. The E. American representative, native in cold swamps and along streams, Vt. to Md., and probably not in regular cult., is now separated as P. Van-Bruntiae, Brit.; from P. caeruleum it differs in having horizontal stout rootstocks, more leafy st., exserted stamens, rounded (not mucronulate) petals, accrescent calyx which becomes twice or three times the size of that of P. caeruleum, broader and fewer ifts., and fewer ovules. It bears considerable resemblance to P. replans, but that species has a diffuse habit, fls. half the size, stamens included and calyx lobed only about one-third its length, the lobes obtuse. This species bears the name of Mrs. Van Brunt. The Rocky Mountain representative is separated as P. occidentale, Greene, differing from P. caeruleum in having slender rootstocks, upper part of st. viscid-pubescent, ifts. narrower, lanceolate, stamens only the length of the corolla, the fruiting calyx not nearly so large and the lobes obtuse or obtusish. L H B
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References
- Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963
External links
- w:Polemonium caeruleum. Some of the material on this page may be from Wikipedia, under the Creative Commons license.
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