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Plants of Taiwan

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    台灣植物誌 第一版  Flora of Taiwan, 1st edition    Vol. 1

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    台灣植物誌第一版  Flora of Taiwan, 1st edition  1: 55


    CHARLES E DEVOL
    SPHENOPSIDA
    Vascular plants with roots; aerial stems erect, grooved, jointed, hollow; leaves without chlorophyll, united into a sheath at the nodes; sporangia unilocular, borne on the back of peltate sporangiophores, arranged in a compact strobilus; spores green, round, with 4 elaters.
    5. EQUISETACEAE

    Rush-like perennial plants with long creeping rhizomes; aerial stems erect; grooved, jointed, without branches or with one to many branches at the nodes. Fertile and sterile stems both green and alike, or the fertile ones lacking chlorophyll; c. s. of internodes usually with a large central cavity (the centrum) and a smaller cavity under each groove (the vallecular canal), and a very small cavity under each ridge (the carinal canal); vascular tissues borne adjacent to carinal canals, the endoderrnis a continuous ring or of separate rings around each vascular bundle; silica borne on ridges of aerial stems, and stomata in the grooves; nodes with a sheath, bearing either persistent or deciduous teeth. Strobilus terminal on main stem or also borne on ends of branches; sporangia borne on the back of stalked sporangiophores; spores round, green with 4 elaters. Gametophyte green, lobed. Chromosome number n = 108 for all reported species.
    1. EQUISETUM L. Only one living genus. Characters of the family.
    Twenty-three species, only one species with two subspecies in Taiwan.
    1. Equisetum ramosissimum Desf., Fl. Atlant, 2: 398, 1800; Hauke in Beih. Nov.
    Hedw. 8: 53, 1963.
    Equisetum ramosissimum var. taikankoense Yamamoto in Trans. Nat. Hist. Soc. Form. 20: 97. 1930.
    KEY TO THE SUBSPECIES
    1. Lower sheaths with a dark brown band; teeth usually persistent; stem with an inner and
    outer continuous endodermis 1a. E. ramossimum ramossissimum
    1. Sheaths green; teeth usually breaking off; c. s. of stem shows each vascular bundle with a
    separate endodermis 1b. E. ramosissimum debile
    la. Equisetum ramosissimum ramosissimum. (ӦWȺ)
    Stems unbranced or with 2-3 branches per node, 20-160 cm tall, 1-7 mm in diameter; stomata in 1.3 lines in the grooves; sheaths longer than wide, the lower
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