Taxon	Illustrator ⠉
	Lysichiton americanus Calla palustris Peltandra sagittifolia	John Myers John Myers John Myers

Herbs, wetland. Rhizomes horizontal. Leaves appearing before flowers, several, emergent, arising along rhizome, also clustered terminally; petiole 1.5–2 or more times as long as blade; blade bright green, simple, not peltate, ovate to nearly round, base cordate, apex short-acuminate to apiculate; lateral-veins parallel. Inflorescences: peduncle erect, as long as or longer than petiole, apex not swollen; spathe white, often green or partially green abaxially, not enclosing spadix; spadix cylindric. Flowers all bisexual or distal ones staminate; perianth absent. Fruits not embedded in spadix, red. Seeds 4–9 (–11), embedded in mucilage. x = 18.

Distribution

Circumboreal

Discussion

Numerous cytogenetic studies have been conducted on Calla with both diploid (2n = 36) and apparently tetraploid (2n = 72) populations reported (see G. Petersen 1989). All counts from North American populations counted have a somatic number of 36 chromosomes.

Species 1.

Selected References

Dudley, M. G. 1937. Morphological and cytological studies of Calla palustris. Bot. Gaz. 98: 556--571.

Lehmann, N. L. and R. Sattler. 1992. Irregular floral development in Calla palustris (Araceae) and the concept of homeosis. Amer. J. Bot. 79: 1145--1157.

Scribailo, R. W. and P. B. Tomlinson. 1992. Shoot and floral development in Calla palustris. Int. J. Pl. Sci. 153: 1--13.

Lower Taxa

Calla palustris