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Published In: Botanical Journal of the Linnean Society 48: 44. 1928. (Bot. J. Linn. Soc.) Name publication detail
 

Project Name Data (Last Modified On 6/6/2016)
Acceptance : Accepted
Taxon Profile     (Last Modified On 8/29/2016)
Description: Plants (180–)250–450 mm high. Corm depressed-globose; tunics of pale, fine fibres. Stem simple or more often 1- or 2-, rarely 3-branched, branches subtended by pale, membranous, attenuate bracts and prophylls 3–5 mm long Leaves mostly 4–8, ± sword-shaped to lanceolate, usually reaching to ±base of spike, 5–15 mm wide, firm-textured; margins moderately to heavily thickened, sometimes crisped. Spike densely 7–12-flowered, branches, when present, with fewer flowers; bracts pale and ± translucent, often flushed pink distally, outer with a single prominent vein and 1- or obscurely 3-toothed, inner forked at tips, 2-toothed, ± as long or slightly longer than outer. Flowers salver-shaped, ± suberect to almost horizontal, pale to deep pink (except for rare white sports), darker pink at tepal bases, pale green to yellow in mouth of tube, unscented; perianth tube slender, widening slightly near mouth, (10–)12–33(–35) mm long, 3–4 mm wide at mouth; tepals subequal, spreading horizontally, 16–22 × 7–11 mm, inner narrower than outer. Filaments 5–10 mm long, inserted 2–3 mm below mouth of perianth tube, thus exserted 3–7 mm; anthers 4–6 mm long, yellow. Style mostly dividing opposite top of filaments or lower to middle third of anthers, rarely shortly beyond anther tips, branches 3–5 mm long. Flowering time: mid-September to late October.
Country: South Africa
South African Province: Western Cape
Distribution and ecology: endemic to the Caledon and Bredasdorp Districts of Western Cape, extending from Bot River in the west to Swellendam and Bredasdorp in the east and south; usually at low elevations on heavy clay soils, also on dry, stony, sandstone slopes.
Diagnosis: pink-flowered Ixia longituba is distinguished among the longer-tubed species of sect. Hyalis by the pink flower colour combined with filaments exserted 5–7 mm, anthers 4–6 mm long and well-developed style branches 3–5 mm long. Perianth tube length is remarkably variable, mostly 12–33 mm long, but as short as 10 mm and occasionally as long as 35 mm. Two subspecies are recognized, subsp. longituba for plants with a perianth tube (10–)12–23 mm and subsp. macrosiphon for those with a tube 25–35 mm long. Subsp. macrosiphon comprises the northern populations of the species, all close to the foot of the Riviersonderend Mtns. However, plants from the south of its range, near Bredasdorp may have a perianth tube 22–23 mm long. There appears to be pattern of tube length across the range from south to north. Historically, Ixia longituba was confused with I. bellendenii but this species has white flowers, a longer perianth tube 35–40 mm long and filaments exserted up to 11 mm. Observations on the pollination biology of a long-tubed population of Ixia longituba show the species is pollinated by the long-proboscid horsefly, Philoliche gulosa.

 

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1 Perianth tube (10–)12–23 mm long; filaments 5–9 mm long and exserted 3–6 mm from tube; anthers 4–5 mm long Ixia longituba N.E. Br. var. longituba
+ Perianth tube 25–33(–35) mm long; filaments 8–10 mm long and exserted 6–7 mm from tube; anthers 5–6 mm long
 
 
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