Pelargonium bubonifolium (Andr.) Pers.
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PELARGONIUM NOTES
Synopsis Plantarum 2 (1806) 227
Section Hoarea

Habit
Deciduous geophyte, 100-230 mm tall when in flower. Tuber turnip-shaped or elongated, sometimes moniliform. 

Leaves
Green, lamina elliptic, 30-140 x 10-40 mm, pinnately compound, irregularly pinnatisect to bipinnatisect, pinnae lobate to laciniate, 20-32 x 10-15 mm, adaxially and abaxially hirsute with long appressed stiff hairs, petiole (20-)30-90 mm long, rigid, erect, hirsute with appressed curly hairs interspersed with appressed stiff hairs and short glandular hars. Stipules subulate, adnate to petioles with apices free, 5-10 x 1-2 mm. 

Inflorescence
Scape, bearing 2-5 pseudo-umbellets, each (5-)8-13(-17)-flowered. Pedicel ca. 0.5 mm.


Sepals
5, lanceolate, apices acute, 6-8.5 x 1-4.5 mm, recurved, green. Hypanthium 10-17(-20) mm long, reddish brown, covered with appressed curly hairs interspersed with long glandular hairs. 

Petals
5, white, lilac or pale pink, patent during anthesis, posterior two with dark red feather-like markings, spathulate, bases cuneate, apices rounded or retuse, reflexed at less than 90 deg during anthesis, 10-16 x 2-4.5 mm, anterior three lgulate to spathulate, bases attenuate, apices rounded, 8-13 x 1.5-3 mm.  


Stamens
5 fertile, protruding from the flower, posterior one 6-8 mm, lateral two 6.5-10.5 mm, anterior two 7-10.5 mm, staminodes white, pollen orange.

Distribution

 
Habitat

Along with P. vinaceum, the distribution of P. bubonifolium extends into southern Namibia - the only two hoareas to jump across the river Orange. It grows in the succulent "desert", although the gently rolling hills east of Steinkopf picutred above are anything but a desert in years with good rainfall. This a pelargonium heaven, with various stem-succulent and geophyte species, from P. oblongatum to P. antidysentericum. P. bubonifolium flowers from August to October when leaves are still green. It bears a striking resemblance with P. parvipetalum, the only difference being the petal length.

Synonims
bulbonifolium Pers.
congestum (Sweet) G. Don.
namaquense Knuth

Literature

E. M. Marais, Taxonomic Studies in Pelargonium, Section Hoarea (Geraniaceae), PhD Thesis, University of Stellenbosch, 1994.


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