Common name: Marsh Horsetail
Scientific name: Equisetum palustre 犬問荊
Genus: Equisetum 木賊屬
Family: Equisetaceae 木賊科, horsetail family
Origin: native
Date: 5th July & 7th July
[291] Deciduous erect perennial, can reach up to 50 cm. Stem regularly branched throughout its length. Branches upcurved. (Fully branched, but also unbranched or partially branched.) Cones are borne on photosynthetic shoots (as shown above).
[281_1] Probably a vegetative shoot (It emerge a bit later than the photosynthetic shoot.)
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The photos below are all photosynthetic shoots:
[277] Showing the internode and the branches at the node.
[281] Stem sheath teeth black with conspicuous pale border (membranous margins). Stem smooth, with 5-9 ridges. (vs stem smooth, with 8-20 ridges, stem sheath teeth black but without membranous margins in field horsetail, Equisetum arvense 問荊、杉菜)
[077_1] (taken on another location)
Note the lowest branch segments (blue arrow) are shorter than the stem sheaths (red rectangle). (vs the lowest branch segments are longer than the stem sheath in field horsetail, Equisetum arvense 問荊、杉菜)
[077_2] (taken on another location)
Fully branched shoots have dark-tipped teeth on side branches.
(vs green, spreading branch teeth in field horsetail, Equisetum arvense 問荊、杉菜)
[275_1] Branches at upper stem.
[275_2] Branches a bit below.
[290] Branches further below, with longer branches.
[283_1] Cones are borne on photosynthetic shoots.
[275_3]
[273_1] Cones showing the hexagonal sporangiophores.
[287_2] Another mature cone.
[287_1] Sporangiophores are split apart from each other, and sporangia underside them could now be seen.
[059_1] (taken on another location)
Stem cross-section, with clearly 6 ridges (5-9 ridges) in this individual.
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