Pelargonium xanthopetalum E. M. Marais
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PELARGONIUM NOTES
S. Afr. J. Bot. 103 (2016) 145.
Section Hoarea

Habit

Deciduous geophyte 80-150(-180) mm tall when in flower, tuber turnip-shaped, elongated or moniliform.



Leaves
Erecto-patent, pinnately compound; lamina regularly pinnate to bi- or tripinnate, elliptic in outline, 20-45 x 20-35 mm, pinnae obtrullate, 10-25 x 8-15 mm, irregularly incised, segments 1.5-3 mm wide, obtuse, ending with a single hair, adaxially sparsely hirsute, abaxially hirsute along main veins, maring ciliate; petiole 20-45 (-80) mm ong, 1.5-2 mm diam., rigid, densely hirsute with long and short, usually appressed hairs; stipules 9-15 mm long, subulate, adnate to petioles for 1/2 their length.

Inflorescence
Scape 10-70 mm long, branched, bearing 2-6(-9) pseudo-umbellets with 3-6(-11) flowers each; peduncles 25-90(-140) mm long, 1-2 mm diam., densely covered with short glandular hairs interspersed with very long stiff patent hairs visible to the naked eye; bracts lanceolate, 5-8 mm long, recurved, adaxially and abaxially hirsute. Pedicel cca. 0.5 mm.


Sepals
5, posterior one erect, others recurved, lanceolate, 7-10 x 1.5-3 mm, apices acute, pale reddish brown to green, indumentum abaxially as on hypanthium. Hypanthium 26-38(-50) mm long, 3-5 times as long as the sepals, green to reddish green,densely covered with short glandular hairs interspersed with long stiff patent hairs.

Petals
5, yellow, patent, flowers bell-shaped during anthesis; posterior two with wine-red feather-like markings, spathulate, 16-26 x 3.5-8 mm, length/width ratio 2.7-5.0, apices rounded, truncate to emarginated, slightly recurved; anterior three without markings, spathulate, 11-21 x 2.5-6 mm, apices rounded. 


Stamens
5 fertile, concealed in the floral sheath, posterior one 2.5-3 mm, lateral two 3-5 mm, anterior two 4.5-6.5 mm, shorter than the sepals, white, anthers dark red, pollen orange. 

Distribution


Habitat

The Overberg renosterveld patches, of which not many remain due to intense agriculture, have long harboured this interesting geophyte, described only in 2016. It looks quite similar to the nearby P. fissifolium and the slightly more remote P. luteopetalum, with which it can be confused. However, the flowers of P. xanthopetalum are exceptionally large and easily recognisable, but just in case there's a key to the yellow flowering species available. It starts flowering early, in September, and can be found in flower until November. 

Literature
S. Afr. J. Bot. 103 (2016) 145.

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