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Pakistan | Family List | Brassicaceae

Tetracme Bunge in Delect. Sem. Hort. Dorpat. 7. 1836. Benth. & Hook. f., Gen. Pl. 1:78.1862; Boiss., l.c. 316; Schulz in Engl. & Prantl, l.c. 560; Vas. in Kom., l.c. 299; Rech. f., l.c. 224.

Tetracme pamirica

Credit: Azmat

  • Notoceras* sect. Tetracmidion DC.
  • Tetracmidion (DC.) Korsh.

    Annual branched herbs with basal branches often subspreading or ascending, ± canescent with short branched substellate hairs. Leaves oblanceolate or oblong-linear, stalked or sessile, sinuate-toothed to almost entire. Racemes often lax in fruit. Flowers minute or small, yellow, straw-coloured to dull-whitish; pedi¬cels usually short and stout. Sepals not saccate at base. Petals about as long to twice as long as the sepals, obovate, cuneate. Stamens 6; filmaent often broad at base but not appendaged; anthers minute, ovate, obtuse. Lateral nectar glands in pairs, minute, pyramidate; middle glands absent. Ovary erect, often oblong-terete, with or without horns developed at the apex, 4-8-ovuled; stigma short, sessile or subsessile (style somewhat distinct). Siliquae erect or curved, oblong-terete, straight or curved, bilocular, dehiscent (rarely indehiscent), with 4, usually conical horns (erect or recurved) near the apex; valves pubescent, usually heterotrichous, with a conspicuous mid-rib; septum membranous, not veined; seeds uniseriate, ovate, not winged, brown.

    About 7 species in C. and W. Asia; 4 in our area.

    Differs from Notoceras primarily by its 4-horned siliquae and different type of hairs.

    1 Siliquae usually curved with recurved horns   Tetracme contorta
    + Siliquae usually straight with straight or divergent horns   (2)
    2 (1) Petals 2-3 mm long; siliquae 4-8 (-10) mm long, ±diverging from the axis; horns 0.5-1 mm long   (3)
    + Petals 1-1.5 mm long; siliquae 10-13 mm long appressed on elongated axis; horns c. 1.5 mm long   Tetracme pamirica
    3 (2) Horns blunt, c. 0.5 mm long; siliquae 4-6 mm long   Tetracme secunda
    + Horns conical, c. 1 mm long; siliquae 8-10 mm long   Tetracme stocksii

    Lower Taxa

    Related Synonym(s):


    Related Objects  

    Flora of China  
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