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Table 1 The Sabah Christisonia compared with five other taxa

From: Range extension of Christisonia scortechinii from mainland Southeast Asia into Borneo, and notes on the distinction between Aeginetia and Christisonia (Orobanchaceae)

  Sabah Christisonia C. scortechinii C. siamensis C. sinensis C. calcarata C. hookeri
Pedicel Short-thick, ca. 1 cm long Short-thick, ca. 1 cm long Short-thick, ca. 1 cm long Short-thick, ca. 1 cm long Slender, 23.5 cm long Short-thick, ca. 1 cm long
Calyx colour White White to purplish White, yellowish to dark purple White Pale yellow Violet
Calyx surface Glabrous Glabrous Glabrous Glabrous Glabrous Glabrousa
Calyx lobes/teeth 2–4 (–5) 2–4 (–5) (2–) 3 (–4) (2–) 3–4 (–5) 5 (4–) 5
Enclosure of corolla tube by calyx (herbarium material) About half Less than half Less than half About half Less than half, to half About half
Enclosure of corolla tube by calyx (fresh material) About a quarter A quarter to a third A third to half A quarter to a third A quarter to a third ?
Corolla colour White White to tinged with violet White tinged with violet White White White with violet seams
Corolla pubescence Glabrous Glabrous Glabrous Glabrous Tube outer surface and both sides of lobes white-pubescent Glabrous
Corolla lobe & throat colour White, with yellow-orange patch from base of lip down to inside the tube White, with dark yellow patch from base of lip down to inside the tube Bluish to violet, with yellow patch from base of lip down to inside the tube White to slightly lilac, with yellow-orange patch from base of lip down to inside the tube White to greyish or bluish, bright yellow patch on all lobes to down inside the tube ?
Hairs at point of attachment of anthers Glabrous Glabrous Distinct hair tuft obstructing corolla throat Glabrous Sparse scattered short hairs on filaments Glabrous
Anther appendage, dorsal side With short acute projection With “projecting acute posterior process” (Prain 1904) With short acute projection With short acute projection With a slender spur-like projection Rounded, without acute projection
Stigma Peltate Peltate Peltate Peltate Bilobed Bilobed
Known distribution N Borneo (Sabah) Peninsular Malaysia, Thailand, Vietnamb Thailand (N NE, SW), India (Nagaland) SW and SE China India, Pakistan India
Habitat Montane sites over 2000 m Montane sites ca. 650–1700 m Mixed deciduous forest at 300–800 m Montane forest, 1500–2000 m Montane sites Montane sites
  1. aNot pubescent as stated in Benniamin et al. (2012)
  2. bMaterial from Thailand (N, NE, SE, Peninsular, from ca. 1200–1655 m) and a more northerly latitude in C Vietnam (642 m) placed in C. scortechinii by Parnell et al. (2014)