Juncus pervetus

Fernald

Rhodora 19: 17. 1917.

Endemic
Treatment appears in FNA Volume 22.

Herbs, perennial, rhizomatous, 7–10 dm. Rhizomes 3–7 mm diam., nodes not swollen. Culms erect, terete, 2–4 mm diam. Cataphylls 2–3, straw-colored, apex rounded. Leaves: basal 0, cauline 1; auricles 0.5–1.5 mm, apex blunt, cartilaginous; blade 25–35 cm × 1–2 mm. Inflorescences terminal panicles of 24–60 heads, 5–10 cm, branches spreading; primary bract erect; heads 15–50-flowered, spheric, 4.5–6 mm diam. Flowers: tepals light-brown, lanceolate to oblong, 2–2.5 mm, nearly equal; stamens 6, anthers longer than filament. Capsules included with beak slightly exserted, chestnut-brown, 3-locular, ovoid, 2.5 mm, apex acute proximal to beak, valves separating at dehiscence, fertile throughout or only proximal to middle. Seeds not seen.


Phenology: Fruiting fall.
Habitat: Upper border of salt marsh
Elevation: 0 m

Discussion

All sheets that I have seen have aborted seeds. Juncus pervetus was thought to be Juncus subnodulosus, a European native (H. Weimarck 1946). It has been shown that this is a distinct species, however (S. Snogerup and B. Snogerup 1996). It would appear that this species is now extinct.

Lower Taxa

None.
... more about "Juncus pervetus"
persistent +
acute +, blunt +  and rounded +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Ralph E. Brooks* +  and Steven E. Clemants* +
Fernald +
25 cm250 mm <br />0.25 m <br /> (35 cm350 mm <br />0.35 m <br />) +
flattened;terete;flattened;terete;terete +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
ascending +  and erect +
terete +, involute +  and flat +
chestnut-brown +
2.5 cm25 mm <br />0.025 m <br /> (?) +
straw-colored +
arranged +  and cluster +
headlike +
Upper border of salt marsh +
15-50-flowered +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
spheric +
pseudoaxillary +  and terminal +
cauline +  and basal +
3 +  and 1 +
not swollen +
green;brown or purplish black +
persistent +
Fruiting fall. +
parietal +  and axile +
snogerup1996a +  and weimarck1946a +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
not tailed;tailed +
green;brown or purplish black +
persistent +
generally longer +
Juncus sect. Septati +
Juncus pervetus +
Juncus subg. Septati +
species +
light-brown +
lanceolate +  and oblong +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 m <br />) +
only proximal;middle +