Roepera flava

Regional Species Conservation Assessments per IBRA subregion.

Least concern

Near threatened

Rare

Vulnerable

Endangered

Critically endangered

Extinct

Data deficient

Adelaide

Arkaroola

Ceduna

Coober Pedy

Hawker

Innamincka

Marla

Marree

Mount Gambier

Oodnadatta

Renmark

Wudinna

Keith

Yunta

Enlarge Map

•

Copy Map

Display IBRA region text

Roepera (formally Zygophyllum which is from the Greek 'zygon' meaning pair and 'phyllon' meaning leaf; referring to the pair of leaflets making up each leaf) is named after Johannes August Christian Roeper (1801 -1885), a German botanist and physician. Flava from the Latin 'flavus' meaning yellow; possibly referring to its light yellow flowers or stems.

Endemic to South Australia and found on the Eyre Peninsula and Kangaroo Island, growing on sandy loam. Native. Uncommon in South Australia. More common after fire or other disturbances.
Herbarium regions: Eyre Peninsula, Kangaroo Island
NRM regions: Eyre Peninsula, Kangaroo Island
AVH map: SA distribution map (external link)

Decumbent or straggly annual shrub to 40 cm high. Leaves petiolate, leaflets longer and broader than flattened petiole, succulent, narrowly elliptic or narrowly obovate, often in unequal pairs, to 20 mm long and 4 mm wide, constricted slightly at junction with petiole but not articulated, obtuse at the apex. Inflorescence solitary at each node with light yellow flowers. Flowering between August and January. Fruits are pale brown broadly obtriangular capsule to 7 mm long and 7 mm wide, 4-angled, 4-celled, truncate at base. Seeds are dark brown to black, ovoid to 2 mm long and 1 mm wide, with slightly wrinkled surface. Seed embryo type is spatulate fully developed.

Collect seeds between October and March. Collect semi-dried and dried capsules by running your hands through the stems of the plant. Mature fruits will come off easily and will have a hard and dark seed inside each segment. Place the capsules in a tray and leave to dry for 1 to 2 weeks, depending on how green the fruit is. Then rub the dried capsules to dislodge the seeds. Use a sieve to remove the unwanted material. 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. Seed viability is usually high.

Location	No. of seeds (weight grams)	Number of plants	Date collected	Collection number Collection location	Date stored	% Viability	Storage temperature
BGA MSB	1,450 (7.4 g) 1,450 (7.4 g)	50+	18-Jan-2017	JRG558 Kangaroo Island	1-Nov-2017	100%	-18°C

Location: BGA — the seeds are stored at the Adelaide Botanic Gardens, MSB — the seeds are stored at the Millennium Seed Bank, Kew, England.
Number of plants: This is the number of plants from which the seeds were collected.
Collection location: The Herbarium of South Australia's region name.
% Viability: Percentage of filled healthy seeds determined by a cut test or x-ray.

Date	Result	T0	T50	Pre-treatment \| Germination medium \| Incubator: Photoperiod / Thermoperiod
Jul-17	16%	21	NA	30% hydrogen peroxide for 10 min, water rinse, seed coat nicked with scalpel; 1% agar; Incubated under winter conditions
Jul-17	13%	21	NA	seed coat nicked with scalpel; 1% agar; Incubated under winter conditions
Jul-17	10%	35	NA	leached in water 24 h; 1% agar; Incubated under winter conditions
Jul-17	0%	NA	NA	30% hydrogen peroxide for 10 min, water rinse; 1% agar; Incubated under winter conditions

Result: Maximum percentage of germination observed.
T0: Number of days before first germinant observed.
T50: Number of days to achieve 50% germination.
Pre-treatment: The initial treatment that the seeds received prior to placement on germination media.
Germination medium: The substrate that seeds were placed on for the duration of the germination experiment.
Incubator conditions:
Photoperiod: The duration of light exposure that the seeds were subject to during a 24 hour period.
Thermoperiod: The constant or diurnal temperatures that seeds were subject to during a 24 hour period.
Winter conditions: 15°C 20 h (3am→11pm); 5°C 4 h (11pm→3am) / 10 h light (8am→6pm); 14 h dark (6pm→8am)
Spring/Autumn conditions: 22°C 12 h (8am→8pm); 10°C 12 h (8pm→8am) / 12 h light (8am→8pm); 12 h dark (8pm→8am)
Summer conditions: 30°C 14 h (6am→8pm); 15°C 10 h (8pm→6am) / 14 h light (6am→8pm); 10 h dark (8pm→6am)

Kangaroo Island (KAN01)	Kanmantoo	Near Threatened [fire dependent]
Southern Yorke (EYB01)	Eyre Yorke Block	Near Threatened [Comes up after fire or disturbance; needs more surveys]
Eyre Hills (EYB03)		Near Threatened [comes up after fire]
Talia (EYB04)		Least Concern [comes up after fire]
Eyre Mallee (EYB05)		Near Threatened [comes up after fire]