Author: آمنه غلامی 
Sterigmostemum longistylum (Boiss.) O. Kuntze
Masoumeh Izadpanah, Amene Gholami and Ahmad Pourmirzaei
Natural Resources Gene Bank, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization, Tehran, Iran.
Uploaded at february 2026
Scientific editor: Parvin Salehi Shanjani
Seed Storage
The storage behavior of this species is orthodox (desiccation-tolerant seeds), dry to 15 to 20% eRH, and store at -20°C.
Germination requirements
The seeds of this species are not dormant. Sterilize seeds before placing them on wet germination paper. Place seeds for two weeks at 4 ºC to germinate uniformly. Then germinate under an alternating temperature regime of 15/20 ºC (the higher temperature for 16 hours in light and the lower one for eight hours in dark).
Morphology
Fruit type: Silique, late dehiscent
Fruit shape: Linear, spreading or curved, submoniliform; pedicel thick, erect to upright 1 to 5 mm long; style green, thin; stigma deeply bilobed, lobes divergent or scorpioid, 1 to 1.5 mm long
Fruit size: Length 2 to 3 mm, width 1.5 to 2.5 mm
Seed shape: Ellipsoid, slightly compressed dorsoventerally sides, radicle longer than cotyledons, accumbent. Surface indicent reticulate, globrous, dull, brown
Seed size: Length 1.22 to 1.42 mm, width 0.59 to 0.87 mm in an accession from Kerman with 1000 seeds weight 0.19 g, which was collected and identified in 2019 by Ahmad Pourmirzaei, and is stored in the Natural Resources Gene Bank of Iran with the accession number 48673
Average 1000 seed weight: 0.13 to 0.19 g
Biological features
Life form: Annual, herbaceous, height 11 to 30 cm, pubescent. Stem branched at the base, ascending
Inflorescence, flower type, and pollination mechanism: Inflorescence lax raceme, flowers clustered in racemes, initially short and dense, becoming long and lax; flowers hermaphrodite, regular; pedicel much shorter than the calyx; polysepalous, sepals often rectangular, sometimes lanceolate, color green with a white membrane margin, 4.5 to 6 mm long; polypetalous, petals almost spatulate, unguiculate, 7.5 to 11.5 mm long, yellow or rarely yellow and purple. Plant monoecious, cross-pollinated. Pollination is carried out by insects and wind.
Time of flowering: June
Time of seed ripening: July
Seed dispersal methods: Seed weight
Geographical distribution: Endemic to Iran, Typus from Shiraz.
Distribution in Iran: Center and South. Mostly in provinces Isfahan, Yazd, Fars, Kerman, and Hormozgan.
Taxonomy
Family: Brassicaceae
Genus: Sterigmostemum
Species: S. longistylum
Persian name: —
References and Links
Assadi, M. Sajedi, S. Fakhr Ranjberi, H. Mirzadeh Vaghefi, S. Moazzeni, H. Khodashenas, M. Khosravi, A. R. Hatami, A. Mehrnia, M. Kaffash, Sh. Heidarnia, N. Sheidai, M. Heidari Rikan, M. Kavousi, K. Sonboli, A. Veiskarami, Gh. And Aminian, F. 2017. Flora of Iran, Brassicaceae, No.143. Research Institute of Forests and Rangelands Press, Tehran, Iran, 954 pp.
Black, M. and Bewley, J.D. 2000. Seed technology and its biological basis. Sheffield Academic Press, 419 pp.
Bojňanský, V. and Fargašová, A. 2007. Atlas of seeds and fruits of central and East-European flora: The Carpathian Mountains region. Springer, Dordrecht, The Netherlands, 1046 pp.
Ghahraman, A. Flore of Iran. Research Institute of Forests and Rangelands with University of Tehran Publication. https://floraofiran.net/index.php.
Mozaffarian, V.A. 1998. Dictionary of Iranian plants names. Farhange Moaser Publisher, Tehran, 671 pp.
Mozaffarian, V.A. 2012. A Pictorial dictionary of botany. Farhange Moaser Publisher, Tehran, 1088 pp.
Sharma, O.P. 2009. Plant taxonomy 2E. Tata McGraw-Hill Education, New Delhi, 563 pp.
