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Hesperolinon congestum : ウィキペディア英語版
Hesperolinon congestum

''Hesperolinon congestum'', or Marin Dwarf Flax, is an annual herb, which is known to occur only in San Mateo, San Francisco and Marin County, California,〔''Marinero Estates Environmental Impact Report'', Earth Metrics Report 7665, city of Tiburon, Ca., May, 1989〕 USA. This plant occurs chiefly on serpentine soils, especially in dry native bunch grasses, chaparral or other grasslands at elevations less than 200 meters. The flowers are congested at the tips of the dichotomously branching stems. ''H. congestum'' is in flower between April and July. The outlook for this plant depends on survival of only about twenty small colonies, most of which are not actively managed for protection, even though the species is State and Federally listed as threatened. This species is also less commonly known as Marin Western Flax.
==Description==
Stems of this wildflower vary between five and fifteen centimeters in length, with linear leaves manifesting alternately.〔Sharsmith 1961 Univ Calif Publ Bot 32:235–314〕 The leaves are typically not planar and not clasping, and stipule glands are well developed with red exudate. Inflorescences are dense, with cymes characteristically open and 0.5 to 8.0 millimeter pedicels somewhat thread-like and ascending. The flower has five hairy sepals, which are three to four millimeters in size, whose margins are minutely glandular. Five petals are widely spreading between three and eight millimeters in dimension. These pink to rose colored petals each manifest three minute scales at the inner base; stamen dimensions vary between 5.5 and 7.0 millimeters. There are five stamens, and anthers are pink to deep purple. There exist six ovary chambers; the number of whitish styles is three. Fruits have a smooth surface exterior. Chromosomal characterization is: n=18.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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