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Pakistan | Family List | Brassicaceae

Alyssum Linn., Sp.PI. 650. 1753. Gen. Pl.ed.5 :722.1754 ; Boiss., l.c.263; Busch in Kom., l.c. 340; T.R. Dudley in Davis, l.c. 362; Rech. f., l.c. 146; J.Baumgartnerin Wiener Neustadt. 24. 1907; 35:1-58.1908; 36:1-38. 1909; E.J. Nyarady in Bull. Gard. Cluj, 7:1-51,65-100.1927; 9: 1-68.1929; T.R. Dudley in J. Arn. Arb. 45(1): 57-100.1964; 45: 358-373.1964.

Alyssum stapfii
Illustration

Credit: Azmat

  • Meniocus Desv.
  • Odontorrhena C.A. Mey.
  • Psilonema C.A. Mey.

    Annual to perennial herbs, often small and with decumbent branches, clothed with short stellate hairs, sometimes heterotrichous, often lepidote. Leaves simple, often linear, entire, without persistent swollen bases. Racemes ebracteate, simple or branched, usually slightly elongating in fruit. Flowers small, yellow, sometimes whitish. Sepals not saccate at base, erect, generally free. Petals slightly to about twice as long as the sepals, narrowly spathulate-oblong; apex often slightly emarginate. Stamens 6; filaments winged (on one side or both) or wingless; anthers short, blunt. Lateral nectar glands in pairs, small, often triangular; middle absent. Ovary sub-orbicular to elliptic, bilocular, 1-8 (mostly 2) ovuled in each locule; style often short with short subbilobed stigma. Siliculae sub-orbicular, broadly ovate or elliptic, bilocular, dehiscent, rarely subdehiscent or indehiscent; valves often tumid with a very narrow flattened margin (sometimes compressed and without a flattened margin), apex slightly emarginate or entire; septum broad, membranous, not veined; seeds on lateral or nearly apical placenta, often very narrowly winged, suborbicular, ± compressed.

    About 100 species, mostly in the Mediterranean region, C. Europe and C. and W. Asia; only 10 species are recorded from our area.


    1 Siliculae flat or plane-compressed, 4-6 (-8) ovules in each locule   (2)
    + Siliculae biconvex, or with tumid valves, 2 ovules in each locule   (3)
           
    2 (1) Siliculae glabrous   Alyssum linifolium
    + Siliculae densely papillose or pilose   Alyssum heterotrichum
           
    3 (1) rennial, caespitose herbs; style 2.5-5 mm long   Alyssum lanceolatum
    + Annual herbs; style less than 2.5 mm long   (4)
           
    4 (3) Valves glabrous   (5)
    + Valves pubescent (with stellate hairs)   (6)
           
    5 (4) Siliculae orbicular, c. 3.5 mm in diam   Alyssum desertorum
    + Siliculae ± obovate, 4-5.5 mm long, 4-6.5 mm broad   Alyssum homalocarpum
           
    6 (4) Style conspicuous (about half as long as the siliculae), 1.5-2 mm long; stamen filaments not appendaged   Alyssum dasycarpum
    + Style inconspicuous, less than 1 mm long; stamen filaments ± appendaged   (7)
           
    7 (6) Siliculae orbicular, 3-5 mm in diam.; branches leafy throughout   (9)
    + Siliculae ± ovate or subovate, slightly longer than broad, usually 3.5-4.5 mm long; branches often leafy above only, giving an involucrate appearance to inflorescence or infructescence   (8)
           
    8 (7) Siliculae slightly retuse at apex with style almost absent or hardly 0.2 mm long; seeds not margined; petals hardly or not emarginate   Alyssum marginatum
    + Siliculae entire or obscurely retuse at apex, with style c. 0.5-1 mm long; seeds margined; petals conspicuously emarginate   Alyssum szowitsianum
           
    9 (7) Siliculae c. 3 mm in diam.; style c.0.5 mm long; pedicels subspreading or ascending   Alyssum turkestanicum
    + Siliculae 4-5 mm in diam.; style 1-2 mm long; pedicels horizontal or deflexed   Alyssum stapfii

    Lower Taxa

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