Table 2. Morphological comparison of C. gigabracteatus with C. tsaiana and C. tschonoskii.CharactersC. gigabracteatusC. tsaianaC. tschonoskiiLEAFShape and sizeLeaf blade elliptic, ovate-elliptic or ovate, 7.0-12.0 × 4.0-7.0 cm, length to width ratio 1.4-2.0, base rounded, rounded-cuneate or cordate, margin regularly or irregularly and doubly minutely serrate, apex acuminateLeaf blade elliptic, oblong, oblong-lanceolate or ovate-lanceolate, 8.0-14.0 × 4.0-7.0 cm, length to width ratio 2.0-2.4, base cordate or obliquely cordate, margin irregularly and doubly minutely serrate, apex acuminateLeaf blade elliptic, oblong or ovate-lanceolate, 5.0-12.0 × 2.3-5.0 cm, length to width ratio 2.0-2.3, base subrounded or subrounded-cuneate, margin doubly setiform serrate, apex acuminate or caudate-acuminateLength of petiole7-14 mm7-15 mm7-15 mmNumber of lateral veins on each side of midvein9-1414-1712-16Lateral veins significantly impressed adaxially or notSignificantly impressed adaxiallyNotNotAbaxially densely villous or sparsely villous along veinsDensely or sparsely villousSparsely villousSparsely villousINFRUCTESCENCESize of infructescence8.0-12.0 × 5.0-5.5 cm10.0-15.0 × 4.0-5.5 cm6.0-10.0 × 3.0-4.0 cmLength of peduncle1.5-2.5 cm1.5-3 cm1-4 cmBRACTSize of bract3.9-4.8 × 1.4-1.8 cm2.5-3.2 × 1.3-1.8 cm1.8-5.0 × 0.6-1.2 cmLength to width ratio2.3-3.11.5-2.12.4-4.2NUTLETShape and size of nutletOvoid-ellipsoid, 5.3-7.0 × 4.0-5.5 mmOvoid-ellipsoid, 5.0-6.0 × 4.5-5.0 mmBroadly ovoid, 4.0-5.0 × 3.0-4.0 mmDensely pubescent or villousDensely pubescent, densely villous at apexDensely pubescent, densely villous at apexGlabrous except sparsely villous at apexDensely resinous glandular or notDensely resinous glandularDensely resinous glandularUsually no resinous glandular