48. Geranium tetragonum L. f.,

Suppl. Pl.: 305. 1782.

≡ Pelargonium tetragonum (L. f.) L’Hér. in Aiton, Hort. Kew. 2: 427. 1789.

– Geranium quadrangulare Thunb. [nom. nud.].

Lectotypus (designated by ALBERS et al., 1995: 344): SOUTH AFRICA: Thunberg s.n. (UPS-THUNB n° 15663!; isolecto-: G-PREL [G00818045, G00818046, G00818047, G00818048]!, UPS-THUNB n° 15662 image seen).

Notes. – Geranium tetragonum was based on a Thunberg specimen from the Cape. ALBERS et al. (1995: 344) designated a specimen in UPS-THUNB as the lectotype. Four duplicates of this collection are also present in G-PREL: three in the Burman herbarium [G00818045, G00818046, G00818047] and one in the Houttuyn herbarium [G00818048]. The latter bears the name G. quadrangulare Thunb. in Houttuyn’s handwriting. The four G-PREL collections are duplicates of the original material and are here considered as isolectotypes.