Flora of North America species comparison

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Eriocaulon decangulare

ten-angle pipewort
Habit Herbs, perennial, 30–110 cm.
Leaves

linear or linear-attenuate, abruptly, then gradually, narrowing, 10–40(–50) cm, apex acute or obtuse.
Inflorescences

scape sheaths shorter than principal leaves;

scapes linear, distally 1–2(–3) mm wide, multiribbed;

heads dull white, hemispheric to nearly globose, 7–15 mm wide, hard, very slightly flattened when pressed;

receptacle copiously hairy;

involucral bracts reflexed, obscured by reflexed proximal bracteoles and flowers, straw-colored, narrowly ovate to lanceolate, 2–4 mm, margins erose to entire, apex acute, glabrous or apex with white, club-shaped hairs;

inner bracts and receptacular bracteoles pale, linear to oblong or lanceolate, 3–4 mm, margins entire, sometimes becoming erose, apex narrowly acuminate, glabrous or apex with white, club-shaped hairs.
Staminate flowers

sepals 2, yellow-white, linear, curved, 3 mm, distal surface abaxially, adaxially with white, club-shaped hairs;

androphore club-shaped;

petals 2, yellow-white, translucent, triangular to linear, nearly equal, with small tuft of white, club-shaped hairs abaxially at apex;

stamens 4;

anthers black.
Pistillate flowers

sepals 2, yellow-white, linear, 2–3 mm, apex acute, abaxially with white, club-shaped hairs at apex;

petals 2, pale, spatulate or narrowly elliptic, 1–2 mm, abaxially with translucent hairs proximally, white, club-shaped hairs distally, or adaxially glabrescent;

pistil 2-carpellate.
Seeds

pale brown, ellipsoid, 0.75–1 mm, very finely cancellate or sometimes with cancellae concealed by rows of delicate nearly appressed hairs.

Eriocaulon decangulare
Phenology Flowering late spring–summer.
Habitat Moist to wet sands or peats of shores, pine savanna, ditches, edges of cypress domes or savanna
Elevation 0–300 m (0–1000 ft)
Distribution
from FNA
AL; AR; DC; DE; FL; GA; LA; MD; MS; NC; NJ; SC; TN; TX; VA; Mexico; Central America (Nicaragua)
[WildflowerSearch map]
[BONAP county map]
Discussion

A possible variety, Eriocaulon decangulare var. latifolium Chapman ex Moldenke [in N. L. Britton et al., N. Amer. Fl. 19(1): 21. 1937], has yet to be thoroughly investigated. This plant typically is in the taller range and has thicker stems and scapes than in the type; it has very stiff blunt leaves to 50 cm × 13–20 mm with thicker scapes, heads 13–20 mm wide, and floral parts in the high range for the species. It occurs in wetter situations than usual for the species, and (fide R. R. Haynes, pers. comm.) flowers later. This morphology occurs in northwestern Florida and southern Alabama within boggy edges of cypress-titi-Nyssa on permanently wet substrates.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 22.
Parent taxa Eriocaulaceae > Eriocaulon
Sibling taxa
E. aquaticum, E. cinereum, E. compressum, E. koernickianum, E. lineare, E. microcephalum, E. nigrobracteatum, E. parkeri, E. ravenelii, E. texense
Synonyms E. serotinum, E. statices, Randalia decangularis, Symphachne xyrioides
Name authority Linnaeus: Sp. Pl. 1: 87. (1753)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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