Hieracium: List of Hieracium Species, Hieracium Pilosella, Hieracium, Hieracium Caespitosum, Hieracium Canadense, Hieracium Lachenalii

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General Books LLC, 2010 - 594 pages
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 29. Chapters: Hieracium albertinum, Hieracium albiflorum, Hieracium anatomy, Hieracium argutum, Hieracium caespitosum, Hieracium canadense, Hieracium coloratum, Hieracium debile, Hieracium gracile, Hieracium greenei, Hieracium hieronymi, Hieracium horridum, Hieracium lachenalii, Hieracium laevigatum, Hieracium longiscapum, Hieracium lucidum, Hieracium musartutense, Hieracium nepiocratum, Hieracium pangoriense, Hieracium pilosella, Hieracium piloselloides, Hieracium radyrense, Hieracium rigorosum, Hieracium sabaudum, Hieracium scouleri, Hieracium snowdoniense, Hieracium sodiroanum, Hieracium sprucei, Hieracium stiptocaule, Hieracium venosum, Hieracium vulgatum, List of Hieracium species, Yellow Hawkweed. Excerpt: The genus Hieracium is a very large genus of flowering plants in the sunflower family (Asteraceae). The database IPNI gives more than 12,100 named taxa, including subspecies and synonyms. The following list consists of about 1,000 accepted species and cited synonyms. Bold for endangered species. A more detailed discussion is given in the article Hieracium. Mouse-ear Hawkweed (Pilosella officinarum, syn. Hieracium pilosella L.) is a yellow-flowered species of Asteraceae, native to Europe and northern Asia. It produces single, citrus-colored inflorescences. It is an allelopathic plant. Like most hawkweed species, it shows tremendous variation and is a complex of several dozens subspecies and hundreds of varieties and forms. It is a hispid (hairy) perennial plant, with a basal rosette of leaves. The whole plant, with the exception of the flower parts, is covered in glandular hairs, usually whitish, sometimes reddish on the stem. The rosette leaves are entire, acute to blunt, and range from 1-12 centimetres (0.39-4.7 in) long and 0.5-2 centimetres (0.20-0.79 in) broad. Their underside is tomentose (covered with hair). The flowering stem (scape) is generally between 5-50 centimetres (2.0-20 in) tall, and sprouts from the centre of the basal rosette. The flowerheads are borne singly on the scape and are a pale lemon-yellow colour, with the outermost ligules having a reddish underside. It flowers from May until August. The plant favours dry, sunny areas. It grows well on sandy and similarly less fertile ground types. It produces stolons are which generate a new rosette at their extremity, each rosette has the possibility of developing into a new clone forming dense mats in open space. It also propagates by seeds. It is a known allelopathic plant, whose roots secrete several substances inhibiting root growth, including its own. It can be controlled through rotation with clover and grasses where possible. Recent research claims that Hieracium pilosella exhibits an atavism b

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