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Centipeda minima (L.) A. Br. & Asch.
Composite
Artemisia minima L., Centipeda orbicularis Lour.
English |
Sneezeweed, sneezewort. |
Indonesia |
Mbakoan (Javanese). |
Philippines |
Harangan (Tagalog), pisik (Bisaya). |
Thailand |
Krataai chan (Central), yaa krachaam (Peninsular), mueat lot (Eastern). |
Vietnam |
C[us]c m[awr]n, c[os]c m[awr]n, c[or] the. |
Centipeda minima occurs from Africa throughout Afghanistan and India to China and Japan, and southwards throughout Southeast Asia to Australia and the Pacific Islands.
Centipeda minima is a small annual, aromatic herb that can grow up to 8-20(-30) cm tall. It is often branched and often prostrate. The stems are slender and ribbed. The internodes are 2-10 mm long and 1 mm large, sparsely to densely covered with fine white and cobwebby hairs.
The leaves are alternate, simple, narrowly spatulate, measure 5-20 mm x 1-7 mm, attenuate at base, obtuse and mucronulate at apex, sometimes 3-lobed at the apex and entire at the lower part. The margins are pinnatilobed or dentate (lobes or teeth mucronulate) and with sparsely hairs on both sides.
The petiole and stipules are absent. The inflorescence is an axillary head which is 2-4 mm in diametre. The peduncle is absent, and with 2-seriate involucral bracts. It is oblong, about 1 mm long, with membranous margins, subdentate, with long cotton-like hairs and rounded apex.The flowers are all tubular and with numerous marginal flowers. The petal is 0.2 mm long, hairy, whitish but with few disk flowers. There are four anthers 0.4 mm long and apically thickened. The ovary is obconical and 4-angled. The style is slender, short and bifid.
The fruit is an oblong, curved achene, 1 mm long and 4-angled. The angles are with appressed hairs 1 mm long, white and with more or less persistent pistil. The pappus is absent. The seedling is with an epigeal germination, with 2 mm long hypocotyl, subsessile cotyledons which are elliptical, measuring 1.8 mm x 0.9 mm, attenuate at base, rounded at apex and hairless. The epicotyl is absent where the first leaves are opposite, subsessile, elliptical, measure1.7-2 mm x 1.1-1.3 mm, with distinct midvein, attenuate base, entire margin, apiculate apex and smooth.
Centipeda minima is common in humid open locations, on thinly grassed patches in savannas, on banks of permanent waterholes, and on muddy banks of rivers. In Indo-China, it is common in fallow rice-fields and waste lands. It occurs from sea level up to 30 m in Java, but up to 1200-2400 m altitude elsewhere.
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