white, tepals 2 - 2.5 mm long, 1.5 - 2.2 mm wide, ovate, glabrous outside or sparsely pubescent, 
sericeous inside, sometimes sparsely so the outer ones, red hairs often present, stamens of whorls 
I & II 1.1 - 1.7 mm long, filaments sericeous ad and abaxially, mostly at base and along median 
section, sometimes glabrous adaxially, anthers 0.7 - 1.1 mm long, glabrous, sporangia four, 
stamens of whorl III 1.1 - 1.6mm long, filament sericeous ad and abaxially, sometimes sparsely 
so, anthers 0.7 - 0.9 mm long, glabrous or sparsely pubescent at base and margins adaxially, 
sporangia four, glands 0.3 - 0.5 mm long, at filament base, sericeous adaxially, staminode 0.5 - 
0.9 mm long, filament sericeous ad and abaxially, head 0.4 - 0.5 mm long, narrowly triangular or 
roughly ovate in outline, glabrous adaxially, glabrous or sparsely sericeous abaxially at base, 
hypanthium ca. 0.5 mm deep, glabrous or sparsely pubescent outside, glabrous or sericeous 
inside, hairs often in patches, red hairs sometinmes present, pistil 1.8 - 2.3 mm long, glabrous, 
ovary ca. 1.2 mm long, ca. | mm wide; fruit 9 - 13 mm long, 7 - 9.5 mm wide, ellipsoid, cupule 6 
- 9 mm long, 3 - 6 mm wide, pedicel absent, or 2 - 7 mm long, | - 1.2 mm wide, tepals persistent. 
Flowers have been recorded (so far only in western Mexico populations) in December, 
February and May. Ripe fruits are present in August - September (in eastern Mexico 
populations), and in March (western populations). The types of vegetation where this species 
grows include mixed temperate forest, pine-oak forest, oak forest, and tropical deciduous forest; 
between 650-1150 (1650) m altitude. Distribution range is localized in two areas of Mexico: 
around Xalapa and Orizaba in Veracruz (facing the Gulf of Mexico), and in some places along 
the Sierra Madre del Sur in Guerrero and Oaxaca (facing the Pacific Ocean). 
C. amplexicaule and C. quadrangulum look very alike. However, in the latter twigs are 
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