Chenopodium strictum

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Chenopodium strictum

Diagnosis

Similar taxa. Chenopodium strictum is similar to Chenopodium album (15), Chenopodium missouriense (16), Chenopodium striatiforme (17) and Chenopodium virgatum (rare casual). Chenopodium strictum differs from Chenopodium album and Chenopodium missouriense in having leaf-blades which are more elliptic and entire or dentate with teeth more equal in size. The olive-green or bluish leaf colour of Chenopodium strictum is also diagnostic. The seeds of Chenopodium strictum are smaller and more ovate in outline than those of Chenopodium album . Chenopodium striatiforme is smaller and more delicate, and its leaves are smaller and of a different shape. The inflorescences of Chenopodium strictum are usually spike-like, and the leaves are olive-green or bluish green.

Distribution

Europe: Austria presentA; Poland introduced: presence questionableB
Distribution. For Norden, see the subspecies.

C and E Europe; SW and C Asia, India; N North America.
A. Wolfgang Adler & Alexander Ch. Mrkvicka 2003: Die Flora Wiens, gestern und heute: p.154, B. Marie Zajac, Adam Zajac & Bogdan Zemanek 2006: Flora Cracoviensis Secunda: p.65 (as Chenopodium striatiforme Murr)

Description

Therophyte (summer-annual). Up to 1 m. Stem terete or angular, striped with green, sometimes red especially in the axils, hard, erect to ascending, branched mainly in the basal part; lowermost branches ascending from an almost horizontal base, long. Leaves with petiole about half as long as the blade; blade ovate to broadly ovate or elliptic, often with almost parallel margins in the middle part, slightly tapering towards the apex, 2-5 x 1-2.5 cm, dark olive-green to bluish green above, beneath often more bluish, sometimes bordered with red; apex obtuse; margin usually ± regularly dentate with small teeth (basalmost teeth sometimes slightly larger than the others) or sometimes entire. Bracts with narrowly trullate to narrowly elliptic blade; margin entire. Inflorescences usually terminal and with few spike-like branches, usually ebracteate; glomerules small. Flowers bisexual or female. Tepals 5, olive-green, connate at base, weakly keeled. Stamens 5. Stigmas 2. Nut falling with the perianth; pericarp easily detached. Seed horizontal, broadly ovate in outline (ratio length/width 1.06-1.17), 1-1.2 mm; edge slightly keeled; seed-coat black, smooth or sometimes with faint radial striae. - Late summer to late autumn. [2n=36]

Discussion

Variation. According to many chromosome counts from populations in various parts of its area, Chenopodium strictum is a tetraploid with 2n=36. It is fairly variable, even though some related taxa have been separated, e.g. Chenopodium striatiforme (17) and Chenopodium virgatum (rare casual), andthe two subspecies recognized here do not cover the entire morphological variation. - The status of needs to be clarified.

Other

F intiansavikka.

Citation

Literature. Dvoiak 1989.
Roth, Nov. pi. sp.: 180 (1821). - Described from India.

Not marked-up

18. Fig. 1 IB

Common Name

Polish (Poland): Komosa drobnolistnaC
C. Marie Zajac, Adam Zajac & Bogdan Zemanek 2006: Flora Cracoviensis Secunda: p.65 (as Chenopodium striatiforme Murr)