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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: 42


    3. SELAGINELLACEAE f
    CHARLES E. DEVOL
    @@@Stems slender, creeping, rooting at intervals; or erect, usually without branches on lower part; rooting near base; or with a short, stout stem made up of a cluster of branches of about the same length, which roll up when dry. Leaves small, simple, with a single vein, always bearing an inconspicuous ligule on the adaxial side at its base (which is only prominent during its early development); vegetative leaves alike or more often dimorphic and usually arranged in two median and two lateral rows on the branches, the median leaves usually smaller and of a different shape from the lateral leaves; the single axillary leaf (best seen from lower side) borne at the forking of each branch, being somewhat different from other leaves. Sporophylls borne in compact strobili; microsporophylls with a single micros- porangium, which contains a large number of rnicrospores; megasporophylls with four megaspores; microspores being much smaller and usually of a different color than that of the megaspores; sporangia round or oval, opening by a vertical slit. (Spore markings and c. s. of stem anatomy are good taxonomic characters, but
    omitted in this treatment.)
    A family with only one genus.
    @@@@@@@@1. SELAGINELLA Beauv. f Characters of the family.
    Over 700 species in the world, 14 from Taiwan.
    KEY TO THE SPECIES
    1. Main stem short, stout, made up of many branches of nearly equal length, densely tufted, curling up when dry; leaves arranged in 4 rows; lateral and median leaves much alike;
    sporophylls uniform ................... . . . . . .. 1. S. tamariscina
    1. Main stem slender, erect or creeping
    2. Main stem erect, rooting at base, in some species bearing rhizophores
    3. Sporophylls monomorphic
    4. All leaves with entire margins . . . . . . . . . . . . . . . . . KKKKKKK.... . . . 2. S. delicatula
    4. Some or all of the leaves with ciliate or serrulate margins
    5. Leaves on lower part of erect stem monomorphic, equal-sided or nearly so, directed upwards
    6. Median leaves ovate, unequal-sided, aristate, ciliate, the midrib distinct
    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. KKKKKKKKK.....4. S. mollendorffii
    6. Median leaves elliptical.rentire or nearly so
    7. Median leaves with 2 nearly parallel curved sunken lines; basal stem . leaves with auricles; rhizome very long creeping; erect stems far apart
    ..................................................................................................... 3. S. involvens