Centaurea nigra - Wikipedia
Centaurea nigra is a species of flowering plant in the family Asteraceae known by the common names lesser knapweed, common knapweed and black knapweed. A local vernacular name is hardheads. It is native to Europe but it is known on other continents as an introduced species and often a noxious weed.
Centaurea nigra L. | Plants of the World Online | Kew Science
It is a perennial and grows primarily in the temperate biome. Austria, Belgium, Denmark, France, Germany, Great Britain, Ireland, Italy, Morocco, Netherlands, Norway, Poland, Portugal, Spain, Sweden, Yugoslavia.
Common knapweed - The Wildlife Trusts
Scientific name: Centaurea nigra. The tightly packed, thistle-like purple flower heads of common knapweed bloom on all kinds of grasslands. Also regularly called black knapweed, this plant attracts clouds of butterflies. Common.
Centaurea nigra - Common Knapweed - First Nature
Centaurea nigra - Common Knapweed. Phylum: Magnoliophyta - Class: Equisetopsida - Order: Asterales - Family: Asteraceae. Equally well known as Black Knapweed, notably in the English Midlands these thistle-like wildflowers are also referred to as Hardheads, because the buds and flower heads are firm and solid. Description
Centaurea nigra — black knapweed - Go Botany
It is a variable hybrid, with marginal corollas usually enlarged and falsely appearing as ray flowers (but sometimes not; usually enlarged in C. jacea, usually not enlarged in C. nigra), either lacking pappus or with vestigial bristles, and involucral bracts with brown apical appendages, those on the middle involucral bracts becoming ...
Centaurea nigra L. - World Flora Online
Fields, roadsides, and waste places; native of Europe, now widely established in s. Can. and n. U.S., s. to Va. and W.Va. July-Oct. Hybridizes with no. 7 [Centaurea jacea L.], producing segregating or stabilized intermediates called C. ×pratensis Thuill., these often approaching C. nigra as to invol, but subradiate as in C. jacea.
Knapweeds – Renz Weed Science - University of …
Characteristics of the bracts are key for distinguishing knapweed species. Seeds are dry, brown, and elliptic in shape with tufts of hair to aid wind dispersal. To view or download a PDF version of this page, click here. Canada thistle’s (Cirsium arvense) flower quantity, size, and shape can be similar to knapweeds.
Centaurea nigra - Species Page - NYFA: New York Flora Atlas
Much less common than the similar C. jacea but growing in similar habitats. The common hybrid with C. jacea is C. x moncktonii. The Centaurea jacea complex which is European in origin is a difficult group due to hybridization, polyploidy, apomixis, and morphological variation (see Keil and Ochsmann [2006] for a brief overview).
Centaurea nigra Black Knapweed, Lesser knapweed PFAF Plant …
Centaurea nigra is a PERENNIAL growing to 0.6 m (2ft). See above for USDA hardiness. It is hardy to UK zone 5 and is not frost tender. It is in flower from June to September, and the seeds ripen from August to October. The species is hermaphrodite (has both male and female organs) and is pollinated by Bees, flies, Lepidoptera (Moths & Butterflies).
Knapweed (Centaurea Nigra) - Identification and Facts - Glenlivet …
2021年11月5日 · Centaurea nigra (common knapweed) produces copious amounts of nectar throughout the flowering season, and in fact, was rated among the top five for most nectar production in a UK plants survey. It attracts many pollinating insects such as butterflies, and is especially favourite among meadow browns , marbled whites , and common blues .
- 某些结果已被删除