Seeds of South Australia
Pterostylis chlorogramma (Orchidaceae)
Green-striped Greenhood
List of species for Pterostylis
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Seed collecting:
September to November
Herbarium region:
South Eastern
NRM region:
South East
IBRA regions
Mount Gambier (SVP02)Southern Volcanic Plain
 Endangered   (IUCN: EN D)   [no records, 2 known pops in Whennans NFR]
Glenelg Plain (NCP02)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU D1+2)   [in Telford Scrub, Honans FR]
Lowan Mallee (MDD04)Murray Darling Depression
 Endangered   (IUCN: EN B2ab(i,ii,iii,iv))   (Probable Decline)
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 Pterostylis]
Name derivation:
Pterostylis from the Greek ‘pteron’ meaning a wing and ‘stylis’ meaning a style or column, referring to the prominent wings found at the top of the column in all species. Chlorogramma from the Greek 'chloros' meaning green and 'gramme' meaning lined, referring to the deep green line on the labellum of the species.
Distribution:
Found in the lower South-east in south Australia, growing in moist well drained soils in open forest and woodland. Also found in Victoria.
Status:
Native. Very rare in South Australia. Rare in Victoria. Vulnerable in Australia under the EPBC Act.
Plant description:
Annual terrestrial orchid growing from an underground tuber to 45 cm tall. Sterile plants form a basal rosette of 3-6 ovate leaves. On flowering plants 5-9 dark green lance-shaped leaves are present on the stem, each to 6 cm long. Inflorescence a green stem with 1-7 translucent green with dark green stripes flowers. Dorsal sepal with short apical point, lateral sepals deflexed, conjoined part oblong, petals slightly falcate, with a well-developed basal flange. Labellum oblong, emerald green (rarely brownish) with two short upturned hooks at the apex. Flowering between July and September.
Fruit type:
Brown papery ellipsoid capsule.
Seed type:
Very small brown long ellipsoid seed with a translucent brown mesh-like covering.
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 one population consisting of more than 6 individuals was recorded from the Nangwarry area. Approximately 9,000 seeds (0.01 g) were banked from this population. Seed viability was 72%.
Seed germination:
Seed germination in Pterostylis species is difficult in the absence of symbiotic mycorrhizal fungi.