Characters;"T. khanhhoaensis";"T. chantrieri";"T. ampliplacenta" Leaves "– number";"5 to 8";"3 to 12";"5 to 10" "– shape of leaf lamina";"oblong to obovate or oblong-elliptic";"oblong to oblong-elliptic";oblong-obovate "– length of leaf lamina";"30–45 cm";"20–50(–60) cm";"55 cm" "– length of petiole";"14–22 × 0.5–1 cm";"11–43 × 0.2–0.5 cm";"30–50 × 0.7–1.2 cm" Inflorescence "– number of flowers";"5 to 10";"15 to 25";25 "– length of scape";"20–38 cm";"6–63 cm";"40–70 cm" "– outer involucral bracts";ovate-lanceolate,;ovate-lanceolate,;"lanceolate to oblong-ovate," "4.5–5.5 × 2–2.5 cm";"2–9 × 0.8–4 cm";"6–8 × 3–4 cm" "– inner involucral bracts";"broadly ovate,";"broadly ovate,";broad-triangular, "6–6.5 × 4–5 cm";"2.5–10 × 1.5–9 cm";"10–16 × 8–10 cm" Flowers "– colour of buds";"dark red";green;black-purple "– outer perianth lobes";"narrowly ovate or triangular,";"oblong-ovate or narrowly triangular,";oblong, "10 × 3–5 mm";"5–12 × 3–8 mm";"12 × 8 mm" "– inner perianth lobes";"broadly ovate,";"broadly ovate or triangular,";broad-ovate, "8–10 × 4–6 mm";"4–11 × 4–12 mm";"12 × 10 mm" "Apex of stigma lobes";2-lobed;3-lobed;2-lobed Ovaries;"5–6 × 8–9 mm";"2–7 × 3–5 mm";"5–8 × 10 mm" Fruits;"3–4 × 1.5–2 cm";"2–4 × 1–2 cm";"4–6 × 2–2.5 cm" Seeds;"1.5–5 × 1–1.5 mm, slightly brown, 4–7-ribbed";"2–4 × 1–2 mm, brown, 9–14-ribbed";"2–3 × 1.5–2 mm, brownish-red, many ribbed"