Circaea


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Circaea

 

a genus of perennial herbs of the family Onagraceae. The rhizome is slender and spreading, and the leaves are opposite. The small white or pink flowers are in apical racemes. There are two stipules, two petals, and two stamens. The pear-shaped or clavate fruit is densely covered with hooklike bristly hairs that are directed downward. There are about ten species distributed in the frigid and temperate zones of the northern hemisphere. The USSR has six species. The most widespread is C. alpina, which grows in damp and swampy mossy forests (mainly spruce and alder forests), often on moss-covered tree stumps. The species is sometimes cultivated as an ornamental.

References in periodicals archive ?
In addition, a number of species very frequent in the black alder woodlands, such as Carex reuteriana, Circaea lutetiana, Equisetum arvense, Eupatorium cannabinum, Geum urbanum, Lythrum salicaria, Osmunda regalis, Poa nemoralis and Solanum dulcamara, are scarce or absent in the ash woodlands.
petiolata metrics in both years and the cover of the five most abundant (highest total cover) herb species in the quadrats: Desmodium glutinosum, Circaea lutetiana, Geranium maculatum, Amphicarpaea bracteata, and Ageratina altissima.
Late Summer- Spring species Summer species Fall species Arisaema dracontium Circaea lutetiana Agastache nepetoides Dodecatheon meadia Cryptotaenia canadensis Ageratina altissima Osmorhiza longistylis Galium concinnum Amphicarpaea bracteata Potentilla simplex Orbexilum onobrychis Hackelia virginiana Sanicula odorata Phytolacca americana Lactuca biennis Triosteum aurantiacum Smilax lasioneura Phryma leptostachya T.
Estrato herbaceo: Holcus lanatus + en 3 y 14; Alliaria petiolata 1 en 4, + en 5; Epilobium hirsutum + en 4 y 6; Rumex induratus y Galium mollugo + en 4 y 14; Polygonum persicaria y Circaea lutetiana + en 8 y 10; Solanum sublobatum + en 10 y 17; Mentha x piperita + en 11 y 16; Leersia oryzoides 1 en 13, + en 18; Epilobium obscurum 1 en 14, r en 17; Sparganium erectum subsp.
rosea, Circaea lutetiana, Cryptotaenia canadensis, Dioscorea villosa, Galium eireaezans, Menispermum canadense, Polygonum virginianum, P.
douglassii, Circaea lutetiana, Claytonia virginica, Cystopteris protrusa, Dicentra cucullaria, Elymus hystrix, Erigenia bulbosa, Erythronium americanum, Euonymus obovatus, Eupatorium rugosum, Galium concinnum, Geranium maculatum, Geum canadense, Hydrophyllum appendiculatum, H.