Seed Information Database

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Storage Behaviour  1000 Seed Weight  Germination  Literature Cited

APG Clade: EUDICOTS - CORE EUDICOTS - ROSIDS - EUROSIDS I
APG Order: Malpighiales
APG Family: CLUSIACEAE
Kew Family: HYPERICACEAE
Genus: Hypericum
Species Epithet: humifusum
Species Author: L.
Life Form: cham.


Storage Behaviour

Storage Behaviour: Orthodox
Storage Conditions: 80 % viability following drying to mc's in equilibrium with 15 % RH and freezing for 9 months at -20C at RBG Kew, WP; The species has been shown to form a long-term persistent soil seed bank, with seeds surviving in the soil for 10 years or longer in at least one investigation (maximum longevity >100 years; Thompson et al., 1997). Survival in ambient conditions for this period of time satisfies the criteria for orthodox behaviour.

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1000 Seed Weight

Average 1000 Seed Weight(g): 0.0368
Details of Component Seed Weights:
  1. 0.0452; (RBG Kew, Wakehurst Place); Seed; *Seed weights reported may include minor covering structures
  2. 0.04524; (RBG Kew, Wakehurst Place); Seed; *Seed weights reported may include minor covering structures
  3. 0.02; (Salisbury, 1942); Seed; Seed mc not stated, but weight is likely to refer to air-dry seed.
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Germination

  1. 80 % germination (seeds sown: 20); germination medium: 1% agar with 250mg/l Gibberellic acid (GA3); germination conditions: light 12/12; 26/16C (Therm 12/12); (RBG Kew, Wakehurst Place)
  2. 100 % germination (seeds sown: 49); germination medium: 1% agar; germination conditions: light 8/16; 20C; 49 days; (RBG Kew, Wakehurst Place)
  3. 98 % germination (seeds sown: 50); germination medium: 1% agar; germination conditions: light 8/16; 15C; 56 days; (RBG Kew, Wakehurst Place)
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Literature Cited
  1. Thompson, K., Bakker, J.P. and Bekker, R.M. 1997. The Soil Seed Banks of North West Europe: Methodology, density and Longevity. Cambridge University Press, Cambridge.
  2. Salisbury, E.J. 1942. The Reproductive Capacity of Plants. G. Bell and Sons, London.
  3. RBG Kew, Wakehurst Place.
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