Daviesia asperula Crisp (1982b: 55)
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publication ID |
https://doi.org/ 10.11646/phytotaxa.300.1.1 |
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persistent identifier |
https://treatment.plazi.org/id/A05187DC-FF1E-D28E-FF3C-5134896052B0 |
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treatment provided by |
Felipe |
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scientific name |
Daviesia asperula Crisp (1982b: 55) |
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63. Daviesia asperula Crisp (1982b: 55) View in CoL , Crisp (1995: 1174), Craigie (2015: 28). Type: South Australia, Kangaroo Island, 6–7 miles [10–11 km] from Rocky River, towards Cape Borda, M.E. Phillips s.n., 29 September 1965. Holotype: CBG 21582; isotype: AD
Compact or spreading shrubs, to 2 m high, minutely scabrid on vegetative parts. Root anatomy with anomalous secondary thickening (cord-rooted). Branchlets with multiple longitudinal ribs. Phyllodes often crowded, spreading, recurved at least at base, vertically compressed, either subulate or obliquely falciform to obliquely narrowly obovate,
146 • Phytotaxa 300 (1) © 2017 Magnolia Press
CRISP ET AL.
pungent, articulate at base, 5–25 × 1–4.5 mm, striate with parallel nerves even when fresh; stipules minute (ca. 0.5 mm), broadly triangular, dark red. Unit inflorescences 1 per axil, racemose, 2–3-flowered; peduncle up to 1 mm long; rachis almost nil. Pedicels 1–2 mm long. Calyx campanulate, 2.5–3 mm long including the 0.5 mm receptacle;
A MONOGRAPH OF DAVIESIA
Phytotaxa 300 (1) © 2017 Magnolia Press • 147 lobes subequal, very short (<0.5 mm long). Corolla : standard very broadly ovate, emarginate, 7–8 × 7–8 mm including the ca. 1 mm claw, orange or yellow-orange with a circular deep red spot surrounding a central vertical rich yellow streak; wings narrowly obovate, auriculate, ca. 5.5 × 2 mm including the 1.5–2 mm claw, orange-red, darker toward base; keel half very broadly obovate, shortly beaked, auriculate, saccate, ca. 4.5 × 2 mm including the 1.5–2 mm claw, orange-red. Stamens slightly dimorphic with filaments ca. equal in length; anthers all 2-celled and basifixed, inner 5 shorter and round, outer 5 with longer, oblong; filaments free. Pod obliquely shallowly obtriangular, acute, somewhat compressed, 10–14 × 7–10 mm; upper suture sigmoid; lower suture acute, sharply curved. Seed broadly ovoid-ellipsoid, 3.3–4 mm long, 2.4–3.3 mm broad, ca. 2.4 mm thick; aril thickly bilobed, ca. 1.5 mm long. ( Fig. 63 View FIGURE 63 ).
Flowering period:— August to October. Fruiting period: September to December.
Distribution:— Endemic in South Australia, occurring on Kangaroo Island and Fleurieu Peninsula ( subsp. asperula only), and on Eyre Peninsula south of 34°S (both subspecies).
Habitat:— Grows in poor, sandy or lateritic soils in mallee or open forest dominated by Eucalyptus spp.
Affinity:— Daviesia asperula is morphologically very similar to D. genistifolia , albeit not very closely related phylogenetically ( Fig. 1B View FIGURE 1 ). The resemblance is closest between D. asperula subsp. asperula and plants of D. genistifolia with vertically compressed phyllodes. Moreover, both species have minute dark red stipules (evident in D. genistifolia from the Flinders Ranges and variably present elsewhere). Daviesia genistifolia is easily distinguished by its smooth branchlets and phyllodes. In addition, the pod of D. genistifolia is smaller (8–11 × 4–8 mm) with a more sharply curved lower suture, the seed is more oblong and compressed, and the aril is 1-lobed and does not project beyond the profile of the seed.
Plants of D. asperula with flattened phyllodes have been referred to D. incrassata and D. polyphylla . Large, inflated pods distinguish both the latter species from D. asperula .
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.