Hart, Taxonomy of Xanthosia huegelii 
445 
The specimens which were found to be n=10 occur in the south-west of Western 
Australia, north from Nannup, whereas specimens from the south coast of Western 
Australia, east from Nannup, and the one specimen from South Australia are n= 20 
(Fig. 3). However, no consistent morphological differences were found to correlate 
with the different chromosome numbers in either species. 
Xanthosia huegelii was previously considered to be restricted to Western Australia; 
however as here circumscribed it is also found in South Australia and Victoria, where 
it was previously treated as X. pusilla. Xanthosia tasmanica also occurs in Western 
Australia, where it constitutes Keighery's unnamed subspecies 'Southern' within 
X. huegelii, as well as occurring in South Australia, Victoria, New South Wales and 
Tasmania. Table 2 summarises the names previously applied to each species in each 
state of their distribution. 
Table 2. Summary of previously applied names to X. huegelii and X. tasmanica in each State of 
their distribution. 
State 
Xanthosia huegelii 
Xanthosia tasmanica 
Western Australia 1 
X. huegelii subsp. huegelii 
X. huegelii subsp. aurea MS. 
X. pusilla 
X. huegelii subsp. 'Southern' MS. 
South Australia 2 
X. pusilla 
X. tasmanica 
Victoria 3 
X. pusilla 
X. pusilla 
Tasmania 4 
- 
X. pusilla 
New South Wales 5 
_ 
misidentified as X. pilosa 
1 Wheeler (1987) and X. huegelii subspecies manuscript names as sorted in PERTH, 
2 Eichler (1986), 3 Willis (1978), 4 Curtis (1963), 5 Brooks and Powell (1992). 
Key to the trifoliolate-leaved herbaceous species of Xanthosia 
1 Stems excorticating when aged; leaf segments linear to oblong or lanceolate; fruit with 
5-9 ribs . 1. X. huegelii 
1* Stems not excorticating when aged; leaf segments elliptic, the lateral segments 
sometimes bifid; fruit with 5-7 ribs . 2. X. tasmanica 
Taxonomy 
1. Xanthosia huegelii (Benth.) Steud., Nomencl. hot. 2: 791 (1841). 
Leucolaena huegelii Benth. in Endl. et al., Enum. pi, 55 (1837). 
Type: Western Australia: Swan River, Hiigel (lecto, here chosen, K!; isolecto W, photo!). 
Bentham's protologue cites 'King Georges Sound et Swan River. (Hiigel)', however, 
only material labelled 'Swan River, Hiigel' has been located. As this material clearly 
fits the details of the protologue it is here designated as the lectotype. 
Xanthosia glabrata Bunge in Lehm., PI. Preiss. 1: 290 (1845). 
Xanthosia pusilla var. glabrata (Bunge) Benth., FI. Austral. 3: 361 (1867). 
Type: In umbrosis sylvae ad fluvium Canning, Perth, Western Australia, Nov 1841, 
Herb. Preiss. No. 2076 (holo P; iso MEL!). 
