Seeds of South Australia
Prasophyllum odoratum (Orchidaceae)
Sweet Leek-orchid
List of species for Prasophyllum
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Seed collecting:
November to February
Herbarium regions:
Gairdner-Torrens, Flinders Ranges, Eastern, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, Northern and Yorke, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Bridgewater (NCP01)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU D2)   [comes up after fire]
Lucindale (NCP03) 
 Least Concern   [comes up after fire]
Tintinara (NCP04) 
 Least Concern   [comes up after fire]
Fleurieu (KAN02)Kanmantoo
 Rare   (IUCN: RA d(ii))   [flowers after fire; needs not burns; widespread in most patches of bush, seen after fire]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Near Threatened   [flowers after fire; needs not burns; widespread in most patches of bush, seen after fire]
Northern Flinders (FLB05) 
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)   [(no records) undercollected; arid-lands orchid; goats, lack of rainfall threats; likes rocky ridges]
Central Flinders (FLB06) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [undercollected; arid-lands orchid; goats, lack of rainfall threats; likes rocky ridges]
Eyre Hills (EYB03)Eyre Yorke Block
 Least Concern   (Probable Decline)   [this sp is a complex, to be sorted taxonomically]
Talia (EYB04) 
 Least Concern   (Probable Decline)   [this sp is a complex, to be sorted taxonomically]
Eyre Mallee (EYB05) 
 Least Concern   (Probable Decline)   [this sp is a complex, to be sorted taxonomically]
Murray Lakes and Coorong (MDD03)Murray Darling Depression
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [comes up after fire]
Wimmera (MDD05) 
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)   [comes up after fire]
Gawler Lakes (GAW03)Gawler
 Least Concern   (Probable Decline)   [this sp is a complex, to be sorted taxonomically]
IBRA regions
DISPLAY ALL
3 of 4 subregionsNaracoorte Coastal PlainLeast Concern
, Vulnerable
Fleurieu (KAN02)KanmantooRare
  (IUCN: RA d(ii))   [flowers after fire; needs not burns; widespread in most patches of bush, seen after fire]
3 of 6 subregionsFlinders Lofty BlockNear Threatened
, Rare
3 of 5 subregionsEyre Yorke BlockLeast Concern
2 of 6 subregionsMurray Darling DepressionRare
Gawler Lakes (GAW03)GawlerLeast Concern
  (Probable Decline)   [this sp is a complex, to be sorted taxonomically]
RSCA map:
Regional Species Conservation Assessments per IBRA subregion. Please click the thumbnail map.
AVH map:
Australian distribution map (external link)
SA Census:
Census of South Australian plants (external link)     [genus Prasophyllum]
Name derivation:
Prasophyllum from the Greek ‘prason’ meaning a leek and ‘phyllon’ meaning a leaf, referring to the leek-like orchid leaf. Odoratum from the Latin 'odoratus' meaning to have a smell or fragrant, referring to the flowers which are often fragrant.
Distribution:
Found in the southern part of South Australia, from the Flinedrs Ranges, Eyre Peninsula to the upper South-east, growing in in a wide range of habitats. Also found in New South Wales, Victoria and New Zealand.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
Terrestrial orchid with slender stem to 80 cm high and a single leaf-blade to 50 cm long and 8 mm diameter, purplish at base. Inflorescence a dense to open spike to 20 cm long with up to 50 white with greenish or reddish markings, often fragrant, flowers. Dorsal sepal lanceolate to obovate, to 12 mm long, decurved to deflexed, lateral sepals to 12 mm long, usually free to base and widely divergent. Petals linear to lanceolate, to 12 mm long, white or with a reddish stripe, margins wavy. Labellum to 12 mm long and 4 mm wide, ovate to lanceolate with lamina recurved to reflexed and protruding between the lateral sepals, upper margins very crisped to ruffled. Callus plate usually bright green. Flowering between October and January.
Fruit type:
Pale brown papery ellipsoid capsules along the spike.
Seed collecting:
Collect fat capsules as they start to dry and turn brown. Pods will split and release the seeds quickly and will require monitoring. To increase the chances of collecting mature pods, it is recommended that a small breathable bag (ie. Organza bags) be used to enclose the developing capsules.
Seed cleaning:
Place the capsules in a container that will hold fine seeds and leave to dry for a few weeks or until the capsule split. Then carefully hold the capsule and tap it gently to release the seeds. Store the seeds with a desiccant such as dried silica beads or dry rice, in an air tight container in a cool and dry place, refrigerator or in liquid nitrogen.
Seed viability:
For the NVC South East Orchid Project three populations consisting of more than 100 individuals were recorded from  Bangham Conservation Park and Border Swamp. Approximately 4030,000 seeds (1.49 g) were banked. Seed viability ranged from 72% to 79%.
Seed germination:
Seed germination in orchids is difficult in the absence of symbiotic mycorrhizal fungi. More research is needed to understand the requirements for seed germination in Prasophyllum species.