Abstract
The southern and tropical Africa genus Hesperantha Ker Gawl., now with 85 species, is distinguished in subfam. Crocoideae by the style dividing into relatively long, usually laxly spreading style branches at or shortly below the mouth of the perianth tube (rarely well within the tube or above the mouth of the tube) and, with a few exceptions, by hard, woody corm tunics. We describe three new species here. H. dolomitica Goldblatt J.C.Manning, a narrow endemic of limestone outcrops on slopes north of the Vars River in the Knersvlakte, Western Cape, has the bell-shaped corms characteristic of the small sect. Hesperantha but is distinctive in the section in its pure white perianth with relatively long tube and soft-textured, falcate to distally trailing leaves. H. laxifolia Goldblatt J.C.Manning from the Pakhuis Mtns, Western Cape, stands out in sect. Hesperantha in its prostate, somewhat succulent foliage leaves, and spikes of 2–5 white flowers with unusually short filaments less than 1 mm long and particularly short anthers, ± 4 mm long. The short style branches, ± 4 mm long, remain suberect rather than laxly spreading. H. secunda Goldblatt J.C.Manning from the Roggeveld Escarpment, Northern Cape, has until now been included in H. pilosa but differs in its secund spike of nodding flowers with short style branches, and leaves with broadly winged margins. We also recognize a new subsp. bracteolata (R.C.Foster) Goldblatt J.C.Manning of H. pilosa (L.f.) Ker Gawl. for populations of plants with diurnal flowers with usually blue or purple (occasionally white) tepals lacking dark pigmentation on the reverse. With additional material to hand, we reduce blue-flowered H. ciliolata Goldblatt to synonymy in subsp. bracteolata and report range extensions for H. pilosa subsp. pilosa, now recorded as far east as the Langeberg near Cloete’s Pass.
Highlights
Hesperantha Ker Gawl., with 85 species (Goldblatt 1984, 2003; Goldblatt & Manning 2007a) is one of the larger genera of Iridaceae subfam
Its range extends from the southwestern Cape and Namaqualand, South Africa, through eastern southern Africa to East Africa, Ethiopia and Cameroon, but is centred in the southern African winter rainfall zone
Hesperantha is distinguished by the style dividing shortly below the mouth of the perianth tube into relatively long, ± straight, usually laxly spreading style branches and, with a few exceptions, by hard, woody corm tunics (Goldblatt & Manning 2008)
Summary
Hesperantha Ker Gawl., with 85 species (Goldblatt 1984, 2003; Goldblatt & Manning 2007a) is one of the larger genera of Iridaceae subfam. H. dolomitica Goldblatt & J.C.Manning, a narrow endemic of limestone outcrops in the Knersvlakte of southern Namaqualand, stands out in its long, narrow, falcate leaves, and pure white flowers with relatively long tube and tepals remaining cupped when fully expanded. H. laxifolia Goldblatt & J.C.Manning from the Pakhuis Mtns of northwestern Western Cape has prostrate, soft-textured basal leaves and among the smallest flowers in the genus, the perianth tube about 5 mm long, tepals 10 mm long and filaments less than 1 mm long Both H. dolomitica and H. laxifolia have bellshaped corms with a flat base and margins finely serrated, placing them in sect. Up to fourteen additional endemics in other families, are endangered if plans for mining the limestone substrate on which these plants grow come to fruition
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