Conyza bonariensis

美洲假蓬

naturalized

Conyza bonariensis (L.) Cronq.

名彙資訊

特徵描述

典藏標本

數位照片

分布位置

相關資訊

名彙資訊

學名發表文獻

Cronq., Bulletin of the Torrey Botanical Club 70: 632. 1943. (Bull. Torrey Bot. Club)

台灣首次記錄發表文獻

Chen, Flora Reipublicae Popularis Sinicae 74: 350. pl. 88. fig. 5–9. 1985. (Fl. Reip. Pop. Sin.)

異名

Erigeron linifolius Willd.

Hayata, The Journal of the College of Science, Imperial University of Tokyo, Japan 18(8): 14. 1904. (J. Coll. Sci. Univ. Tokyo)
Erigeron sumatrensis auct. non Retz.

Yamamoto, Journal of the Society of Tropical Agriculture 8: 347. 1936. (J. Soc. Trop. Agr.)
Erigeron crispus Pour.

Kitamura, Acta phytotaxonomica et geobotanica eng 9: 99. 1940. (Acta Phytotax. Geobot.)
Erigeron bonariensis L.

Li, Flora of Taiwan 4: 858. 1978. (Fl. Taiwan)

各語言俗名

中

野塘蒿. 簑衣草. 野地黃菊. 香絲草. 野桐蒿.
英

Wavy-leaf fleabane. Hairy fleabane. Flax-leaf fleabane. Bonar horseweed. Hairy horseweed. Asthmaweed. Linifolius conyza. Sumatra fleabane.
日

いぬぢおうぎく. のぢおうぎく. あれちのぎく.
原

Zyakarukaru (Paiwan).
台

Siau sit chháu.

參考文獻

Wu, Yang, Teng, Chang, Yang and Hsieh, Taiwania 55(2): 147. 2010.
Chen, The Invasive Alien Plant in Miaoli 100. 2006. (Invas. Al. Pl. Miaoli)
Yang, A list of plants in Taiwan . 1982. (List Pl. Taiwan)

特徵描述

生活型

herb

形態特徵

Annual or biennial herbs. Stems erect, 20–50 cm tall, branched upward, lateral shoots regularly overtopping main axis after appearance of heads, coarsely pilose and hirsute.
Leaves densely arranged, pilose on both surfaces; basal leaves often withered at anthesis; lower leaves narrowly oblanceolate or oblong, 5–14×0.5–2 cm, apex acute, base attenuate, sessile, margins coarsely serrate-dentate or pinnatifid with up to 5 teeth or lobes on each side; upper leaves smaller, linear-lanceolate, nearly entire.
Heads many, 4–6 mm long, 5–7 mm wide, pedunculate, in terminal racemose-panicles. Involucre urceolate, bracts in 3 or 4 series, linear lanceolate, acute, herbaceous, densely pubescent, subequal or outer ones shorter, inner bracts 3–4 mm long, outer bracts ca. 2 mm long. Outer florets numerous, in 6–7 marginal rows, corolla white, filiform-tubular, 2–2.2 mm long, ligule minute, obscure; style ca. 2.5 mm long, slightly longer than pappus. Central disc florets 12–20, corolla 3–3.5 mm long; upper part narrowly cylindric, longer than lower filiform part, 5-lobed, yellowish.
Achenes oblong to oblanceolate, ca. 0.5–1 mm long, 0.2–0.3 mm thick, compressed, ribbed on both sides, minutely pubescent, pale umber. Pappus 1-seriate, united at base, tawny or reddish, capillary, bristles subequal, 3–3.5 mm long at maturity.

物候

Fl. Mar-Nov.

花	1	2	3	4	5	6	7	8	9	10	11	12
果	1	2	3	4	5	6	7	8	9	10	11	12

分布

台灣 : local in lowlands and littoral regions.
世界 : Native of South America.

引證標本

TAIPEI: Yangmingshan, Peng 13505; Shimen, Kuo 10952. TAOYUAN: Shalun, Peng 7716. HSINCHU: Lienhuassu, Peng 11501. MIAOLI: Tungsiao, Peng 11570. TAITUNG: Lanyu Is., Peng 10639. PINGTUNG: Hsiaoliuchiu, Huang 8250.