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''Dichelostemma capitatum'' (syn. ''D. pulchellum''), called blue dicks, purplehead and brodiaea (alternate spellings, brodiea, brodeia〔 (Encyclopedia of Herbs ). Also see Talk:Dichelostemma capitatum 〕) occur in Arizona, California, Oregon, Utah, New Mexico, and northern Mexico. ==Subspecies== *''Dichelostemma capitatum'' subsp. ''capitatum'' *''Dichelostemma capitatum'' ssp. ''pauciflorum'' (Torrey) Keator (common name - desert hyacinth〔Mojave Desert Wildflowers, Pam MacKay, 2nd ed., 2013, ISBN 978-0-7627-8033-4〕) ==Description== ''Dichelostemma capitatum'' is an herbaceous perennial growing from an underground corm to a height of as much as 60 cm. It has 2–3 leaves which are 10–40 cm long. The inflorescence is head- or umbel-like, and dense. It usually contains 2 to 15 flowers, which have a blue, blue-purple, pink-purple, or white perianth. The flower tube is 3–12 mm and is narrowly cylindrical to campanulate. Flowers have six fertile stamens, deeply notched, lanceolate, white, angled inward, slightly reflexed at tip, with outer filaments wider at the base. It has a twisted and fleshy peduncle, a set of membranous, petal-like stamen appendages around the anthers, and angular black seeds. It reproduces from seed and vegetative means in the form of cormlets. The cormlets are attached to the parent corm by stolons and are sessile, produced in the axils of the old leaf bases on the mature corm. Plants thrive in open disturbed environments, and are a common post-fire succession species in chaparral. ''Dichelostemma capitatum'' occurs from sea level up to 2,300 meters. It inhabits a wide variety of plant communities, including vernal pools, valley grassland, scrub, coniferous forests, and open woodlands. It seems not to colonize after fire by seed, but rather by cormlets. After fire, plants are exposed to unshaded environments with little brush competition, and vigorously flower in open environments with increased soil nutrients. Grasslands that have been burned may exhibit thousands of plants where none have appeared in recent years. Corms may sit for a decade or more and wait for fire or other favorable environmental conditions before breaking ground. Suppression of fire may cause increased shade and plant competition and decrease population numbers of ''Dichelostemma capitatum''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dichelostemma capitatum」の詳細全文を読む スポンサード リンク
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