Compilation
Thalia divaricata

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Name

Identification
Thalia divaricata Chapm. [family MARANTACEAE ] (stored under name); Verified by Not on Sheet,
Related name
  • Thalia divaricata
  • Thalia geniculata
Common name
  • arrowroot, Flora of North America Vol. 22
  • Fire-flag, Flora of North America Vol. 22

Flora

Entry for Thalia geniculata Linnaeus [family MARANTACEAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 22,
Names
Thalia geniculata Linnaeus [family MARANTACEAE], Sp. Pl., 2: 1193. 1753
Thalia divaricata Chapman [family MARANTACEAE]
Thalia trichocalyx Gagnepain [family MARANTACEAE]
Thalia welwitschii Ridley [family MARANTACEAE]
Information
Plants 1--3.5 m. Leaves: basal 2--6, cauline 0--1(--2); sheath green or occasionally red-purple, glabrous; petiole green or occasionally red-purple, glabrous; pulvinus caramel-colored, olive-green, or red-purple, 0.3--2.5 cm, glabrous; blade ovate to narrowly ovate, 19--60 ´ 4--26 cm, firm, stiff-papery, base rounded to subtruncate, apex acute to acuminate, occasionally obtuse with acuminate tip, abaxial surface green, faintly pruinose, glabrous, adaxial surface glabrous. Inflorescences lax, broadly spreading to pendeant, paniclelike array, up to ca. 0.6  1 m; scapes 0.8--2.5 m; rachis not pruinose; internodes 5--20 mm; bracts not pruinose, green or streaked or tinged with purple, narrowly ovate, 1.3--2.8 cm, herbaceous, sparsely to densely villous. Flowers: sepals 0.5--2 mm; outer staminode faint lavender to purple, 15--20 ´ 5--10 mm; callose staminode base yellow, apex purple, apical rim, reflexed, petal-like. Fruits ellipsoid, 9--12 ´ 6--7 mm. Seeds smooth dark brown to black, ellipsoid, 7--10 ´ 5--6 mm. 2n = 18 (Senegal) 2n = 26 (in cultivation).
Phenology
Flowering summer--fall (late Jun--Dec)
fruiting summer--winter (Aug--Jan)
Distribution
USA Fla.USA La.
Discussion
This species has the widest distribution known for any of the Marantaceae, occurring in both Africa and the Americas. Because of the marked lack of variation among the African populations, it is believed that its occurrence in west Africa was a historically recent, probably accidental, introduction (L. Andersson 1981b). The variation in pubescence and bract size within the American continent has been used as the basis for describing additional species or varieties (L. Andersson 1981b). Populations of Thalia geniculata with a striking red-purple coloration on the petiole, sheath, and pulvinus were described as T. geniculata f. rheumoides Shuey (A. G. Shuey 1975) . Such homogeneous populations are to be expected in a mainly selfing species.

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