Aster subulatus

掃帚菊

naturalized

Aster subulatus Michaux

名彙資訊

特徵描述

典藏標本

數位照片

分布位置

相關資訊

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名彙資訊

學名發表文獻

Michaux, Flora Boreali-Americana 2: 111. 1803. (Fl. Bor.-Amer.)

台灣首次記錄發表文獻

Yamamoto, The Botanical magazine, Tokyo 40: 31. 1926. (Bot. Mag. Tokyo, 植物學雜誌)

異名

無

各語言俗名

中

掃把菊. 帚紫菀. 帚馬蘭. 突錐紫菀. 箒菊.
英

Slim aster. Eastern annual saltmarsh aster. Annual saltmarsh aster.
日

ほうきぎく.

參考資料

Wu, Yang, Teng, Chang, Yang and Hsieh, Taiwania 55(2): 146. 2010.
Chen, The Invasive Alien Plant in Miaoli 43. 2006. (Invas. Al. Pl. Miaoli, 苗栗地區重要外來入侵植物圖鑑)
Yang, A list of plants in Taiwan . 1982. (List Pl. Taiwan, 台灣植物名彙)

特徵描述

生活型

herb

形態特徵

Annual erect herbs, rarely biennial, tap-rooted, stems terete, 30–120 cm tall, glabrous, sparsely branched or densely branching upward.
Leaves grayish green, glabrous, smooth, linear to lanceolate, less than 1 cm wide, almost same width throughout, apex long attenuate to obtuse or rounded, sessile, subamplexicaul, margins entire, leaves on branches reduced, bract-like.
Heads ca. 5–6 mm across, in loose racemose inflorescences, scattered or solitary on ascending branches or branchlets. Involucre subcylindric, 5–8 mm tall, 1.5–2 mm across, bracts 4 or 5 seriate, linear-lanceolate to subulate, acute, inner bracts gradually longer, herbaceous. Ray florets pistillate, numerous, ligules white or sometimes pale pink, 2–5 mm long, slightly exserted at anthesis. Disc florets yellow. Pappus longer than tubular part of floret at anthesis, elongate soon after anthesis, 5–6 mm long at maturity.
Achenes cylindric, sparsely appressed short hairy, pale brown; pappus soft and fine.
Chromosome number, 2n = 18 (Peng & Hsu, 1978).

物候

Flowering in autumn.

分布

台灣 : Now common on waste ground and roadsides in northern Taiwan.
世界 : Throughout the temperate northern hemisphere, introduced from North America and naturalized.

引證標本

TAIPEI: Nankang, Peng 11096, Peng 12155 & 13479. TAOYUAN: Lower Paling to Mt. Lalashan, Peng 12105; Tachi, Peng 13501. HSINCHU: Mt. Wuchihshan, Peng 12923 & 12129; Hukou, Peng 7226. MIAOLI: Yuanli, Peng 11115, Peng 11109.