Eriocaulon nigrobracteatum

Orzell & E. L. Bridges

Phytologia 74: 105, figs. 1–4. 1993.

IllustratedEndemicConservation concern
Treatment appears in FNA Volume 22.

Herbs, perennial, 5–15 (–19) cm. Leaves linear-attenuate, 0.5–1.5 (–4) cm, apex subulate. Inflorescences: scape sheaths longer than principal leaves; scapes filiform, 0.3–0.4 mm, 4-ribbed; mature heads blackish at level of involucre, white above it, hemispheric to globose, 3–4 (–5) mm wide, soft; receptacle glabrous; involucral-bracts spreading, not obscured by bracteoles and flowers, blackish, very lustrous, broadly ovate to orbiculate, 1–3 mm, margins entire to erose, apex broadly rounded, glabrous; inner bracts, receptacular bracteoles blackish or with pale base, broadly to narrowly ovate, 2–3 mm, margins somewhat erose with age, apex rounded or apiculate, margins and abaxial surfaces with white, club-shaped hairs, apically ciliate. Staminate flowers: sepals 2, gray-brown, broadly spatulate to oblong-obovate, curved, keeled, 1–1.2 mm, keel and margin with white, club-shaped hairs; androphore club-shaped to campanulate, flaring; petals 2, oblong-obovate, nearly equal, 1 mm, apex ciliate and abaxially with white, club-shaped hairs; stamens 4; anthers black. Pistillate flowers: sepals 2, gray, oblong, curved, keeled, 1 mm, adaxial surfaces pilose, hairs translucent, sharp, apically with white, club-shaped hairs; petals 2, pale, short-stipitate or nearly sessile, oblong, 1 mm (narrower and longer than those of E. koernickianum), apex obtuse, adaxial surface and margins with white, club-shaped hairs; pistil 2-carpellate. Seeds brown, nearly round, 0.3 mm, obscurely reticulate, alveolae irregularly and horizontally rectangular.


Phenology: Flowering spring.
Habitat: Muck of deep sphagnous seep bogs in longleaf pinelands
Elevation: 0–100 m

Discussion

Eriocaulon nigrobracteatum is a very limited, local endemic whose relationships with E. aquaticum should be clarified.

Of conservation concern.

Lower Taxa

None.

"narrower" is not a number.

rectangular +
flaring +, club-shaped +  and campanulate +
longitudinal +
versatile +  and dorsifixed +
Obtuse (?) +, Apiculate (?) +, Rounded (?) +  and Subulate (?) +
peglike +  and glandlike +
cleft +, fringed +  and bladelike +
Robert Kral +
Orzell & E. L. Bridges +
branching +, monopodial +  and sympodial +
lacunate +
stipelike +
greener +  and pale +
lingulate;triangular-acuminate;linear-attenuate +
narrowing +
0–100 m +
mealy-starchy +
epipetalous +
pistillate +  and staminate +
unappendaged +
pale +  and dark +
subapical +  and adaxial +
Muck of deep sphagnous seep bogs in longleaf pinelands +
multicellular +
club--shaped +  and sharp +
white +  and blackish +
hemispheric;globose +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
involucrate +  and simple +
axillary +  and terminal +
short-cylindric +  and buttonlike +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
septate +  and unbranched +
1.5 cm15 mm <br />0.015 m <br /> (4 cm40 mm <br />0.04 m <br />) +
linear-attenuate +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
entire +  and erose +
orthotropous +  and pendulous +
adaxial-apical +
sessile +  and short-stipitate +
separating +  and separated +
1 cm10 mm <br />0.01 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering spring. +
thinner +  and narrower +
orzell1993a +
spongy-septate +
spongy +  and fibrous +
multiribbed +, twisted +  and simple +
1;several +
filiform +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
sculptured +
gray +  and gray-brown +
keeled;oblong;keeled;broadly spatulate;oblong-obovate +
1 cm10 mm <br />0.01 m <br /> (?) +, 0.1 cm1 mm <br />0.001 m <br /> (?) +  and 0.12 cm1.2 mm <br />0.0012 m <br /> (?) +
Illustrated +, Endemic +  and Conservation concern +
dilated +
unequal +
prostrate +  and repent +
elongate +
short-to-elongate +
unappendaged +
Eriocaulon nigrobracteatum +
Eriocaulon +
species +
scapose +  and caulescent +
pubescent +  and glabrous +