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Katostblærespiræa (Physocarpus malvaceus), også skrevet Katost-Blærespiræa, er en løvfældende og mangegrenet busk med en opret, senere overhængende vækstform. Marven er lysebrun. Frøene er meget eftertragtede af agerhøns og fasaner.
Barken er først glat og brun med to tydelige striber nedad fra hvert bladar. Senere bliver den stribet i brunt/beige, og til sidst skaller den af i lange strimler. Knopperne er spredte, butte og lysegrønne.
Bladene er Ribes-agtige, dvs. 3-5 lappede med rynket overflade og savtakket rand. Bladene får ingen høstfarve, men bliver siddende langt ind i november. Oversiden er friskt grøn, mens undersiden er noget lysere. Blomstringen sker i maj-juni. Blomsterne sidder i skærme fra bladhjørnerne. Blomsterne er grønligt-hvide og uden duft. Frugterne er oppustede, blæreagtige og helt tyndvæggede. Frøene spirer ikke særligt godt.
Rodnettet er dybtgående og vidt udbredt med mange finrødder lige under jordoverfladen. Nedliggende grene slår rod.
Højde x bredde og årlig tilvækst: 5 x 3 m (30 x 30 cm/år).
Katostblærespiræa gror i Washington og Oregon i det vestlige USA, hvor den danner krat og skovbryn på fugtig, veldrænet bund (flodbredder). Den kan trives i kystnært klima og på alle jordtyper, bortset fra sur, tørveagtig jord.
På de nordøstvendte skråninger af bjergene i det nordøstlige Oregon, findes arten i krat og som bund i skove sammen med bl.a. skyggeblomst, Arnica cordifolia (en art af guldblomme), birkespiræa, Ceanothus velutinus, douglasgran, ellebladet bærmispel, engelmanngran, gulfyr, hedemelbærris, klitfyr, kæmpeædelgran, mosebølle, Pyrola picta (en art af Vintergrøn-slægten), skovjordbær, Thalictrum occidentale (en art af frøstjerne), vestamerikansk lærk, vestamerikansk mahonie og vestamerikansk taks.[1]
Katost-Blærespirea er god til kant- og underplantning i læ- og vildtplantninger. Planten tåler kraftig beskæring. Den tåler desuden skygge og vind.
Katostblærespiræa (Physocarpus malvaceus), også skrevet Katost-Blærespiræa, er en løvfældende og mangegrenet busk med en opret, senere overhængende vækstform. Marven er lysebrun. Frøene er meget eftertragtede af agerhøns og fasaner.
Physocarpus malvaceus is a species of flowering plant in the rose family known by the common name mallow ninebark. It is native to western North America, where its distribution extends from British Columbia to Nevada to Wyoming.[2]
This plant is a deciduous shrub usually growing up to 2.1 meters tall,[2] sometimes reaching 3 meters.[3] It can form dense thickets. The branches are hairless, and older ones have shreddy bark. The leaves have three to five lobes and serrated edges. Dark green when mature, they turn brownish red by early fall. The inflorescence is a corymb of flowers that have white petals measuring about 4 millimeters in length. The fruit is a follicle roughly one centimeter long.[2][3][4]
This shrub grows in forests, woodlands, and oak scrub. The forests are dominated by subalpine fir (Abies lasiocarpa), grand fir (A. grandis), Engelmann spruce (Picea engelmannii), Douglas-fir (Pseudotsuga menziesii) and ponderosa pine (Pinus ponderosa). It is associated with plant species such as oceanspray (Holodiscus discolor), common snowberry (Symphoricarpos albus), mountain snowberry (S. oreophilus), white spirea (Spiraea betulifolia), serviceberry (Amelanchier alnifolia), Oregon-grape (Mahonia repens), and pinegrass (Calamagrostis rubescens). This shrub is codominant with Douglas-fir in a common plant community.[2]
This shrub is a pioneer species that increases after disturbance and decreases as the overstory grows back and shades it out. It grows rapidly after events such as wildfire, sprouting up from its rhizomes. It is considered a "fire-resistant" plant. It survives fire and resprouts, becoming more common on burned sites than unburned.[2]
This is not a favored food plant among wild and domesticated herbivores. It does provide good cover for small animals.[2] The Dusky Flycatcher (Empidonax oberholseri) nests in it.[3]
This plant is known to hamper regeneration of forest habitat after disturbance such as fire or logging. It outcompetes new conifer seedlings. It is controlled with herbicide spray in some regions.[2][3]
Physocarpus malvaceus is a species of flowering plant in the rose family known by the common name mallow ninebark. It is native to western North America, where its distribution extends from British Columbia to Nevada to Wyoming.
This plant is a deciduous shrub usually growing up to 2.1 meters tall, sometimes reaching 3 meters. It can form dense thickets. The branches are hairless, and older ones have shreddy bark. The leaves have three to five lobes and serrated edges. Dark green when mature, they turn brownish red by early fall. The inflorescence is a corymb of flowers that have white petals measuring about 4 millimeters in length. The fruit is a follicle roughly one centimeter long.
This shrub grows in forests, woodlands, and oak scrub. The forests are dominated by subalpine fir (Abies lasiocarpa), grand fir (A. grandis), Engelmann spruce (Picea engelmannii), Douglas-fir (Pseudotsuga menziesii) and ponderosa pine (Pinus ponderosa). It is associated with plant species such as oceanspray (Holodiscus discolor), common snowberry (Symphoricarpos albus), mountain snowberry (S. oreophilus), white spirea (Spiraea betulifolia), serviceberry (Amelanchier alnifolia), Oregon-grape (Mahonia repens), and pinegrass (Calamagrostis rubescens). This shrub is codominant with Douglas-fir in a common plant community.
This shrub is a pioneer species that increases after disturbance and decreases as the overstory grows back and shades it out. It grows rapidly after events such as wildfire, sprouting up from its rhizomes. It is considered a "fire-resistant" plant. It survives fire and resprouts, becoming more common on burned sites than unburned.
This is not a favored food plant among wild and domesticated herbivores. It does provide good cover for small animals. The Dusky Flycatcher (Empidonax oberholseri) nests in it.
This plant is known to hamper regeneration of forest habitat after disturbance such as fire or logging. It outcompetes new conifer seedlings. It is controlled with herbicide spray in some regions.
Physocarpus malvaceus, appelé communément physocarpe à feuilles de mauve[1], est une espèce nord-américaine de Physocarpus de la famille des Rosaceae.
Physocarpus malvaceus est un arbuste à feuilles caduques atteignant généralement 2,1 mètres de hauteur[2], atteignant parfois 3 m. Elle peut former des fourrés denses. Les branches sont dépourvues de poils et les plus âgées ont une écorce rugueuse. Les feuilles ont trois à cinq lobes et des bords dentelés. De couleur vert foncé à maturité, elles virent au rouge brunâtre au début de l'automne. L'inflorescence est un corymbe de fleurs dont les pétales blancs mesurent environ 4 mm de long. Le fruit est un follicule d'environ un centimètre de long[2].
Physocarpus malvaceus est présente dans l'ouest de l'Amérique du Nord, de la Colombie-Britannique au Nevada et au Wyoming[2].
L'arbuste pousse dans les forêts, les bois et les garrigues. Les forêts sont dominées par Abies lasiocarpa, Abies grandis, Picea engelmannii, Pseudotsuga menziesii, Pinus ponderosa. La plante est associée à des espèces de plantes telles que Holodiscus discolor, Symphoricarpos albus, Symphoricarpos oreophilus, Spiraea betulifolia (es), Amelanchier alnifolia, Mahonia repens et Calamagrostis rubescens. L'arbuste est co-dominant avec Pseudotsuga menziesii dans une communauté végétale commune[2].
Physocarpus malvaceus est une espèce pionnière qui augmente après les perturbations et diminue à mesure que la canopée se développe et fait de l'ombre. Elle se développe rapidement après des événements tels que des incendies de forêt, poussant avec ses rhizomes. On le considère comme une plante résistante au feu. Elle survit au feu et aux repousses, devenant plus commune sur les sites brûlés que non incendiés[2]. On sait que cette plante entrave la régénération de l'habitat forestier après une perturbation telle qu'un incendie ou une exploitation forestière. Il surpasse les nouveaux semis de conifères. Il est contrôlé par une pulvérisation d'herbicide dans certaines régions[2].
Physocarpus malvaceus n'est pas une plante alimentaire de prédilection des herbivores sauvages et domestiques. Elle fournit une bonne couverture pour les petits animaux[2]. Le Moucherolle sombre (Empidonax oberholseri) y niche[3].
Physocarpus malvaceus, appelé communément physocarpe à feuilles de mauve, est une espèce nord-américaine de Physocarpus de la famille des Rosaceae.
