Carex aboriginum

M. E. Jones

Biol. Ser. Bull. State Univ. Montana 15: 69. 1910.

IllustratedEndemicConservation concern
Treatment appears in FNA Volume 23. Treatment on page 413. Mentioned on page 402, 403, 414.

Plants cespitose. Culms 55–80 cm, distally slightly roughened. Leaves 3–4.5 mm wide. Inflorescences: peduncle of terminal spike 0.5–2 cm; proximal bracts shorter or longer than inflorescences; spikes erect, separate, pedunculate, short-oblong or elongate, 15–30 × 9–12 mm; lateral 1–3 spikes pistillate, of varying lengths, mostly shorter than terminal spike or of similar lengths; terminal spike gynecandrous or staminate, 8–25 mm. Pistillate scales lanceolate, shorter and narrower than perigynia, apex acute or mucronate, spinulose. Perygynia veined, broadly ovate, (4.7–) 5–6.6 × 2.2–3.4 mm, distal margins serrulate, spinulose, apex gradually beaked; beak 0.5–1 mm, bidentate, teeth spreading, spinulose. Achenes nearly filling body of perigynia.


Phenology: Fruiting early May–Jun.
Habitat: On well-drained soils of seasonally wet stream banks
Elevation: 700–1000 m

Discussion

Of conservation concern.

Carex aboriginum was not seen from the time of its original collection in 1899 until its rediscovery, in the vicinity of the type locality in 1999 (C. Bork 2000), and at a nearby site in 2000. The abundant new material matches the type specimens in all respects. On the basis of the type alone, F. J. Hermann (1970) considered C. aboriginum to be very close to C. serratodens, which the new specimens support. Carex aboriginum has pistillate spikes with perigynia clearly larger and staminate spikes on longer peduncles. These morphologic distinctions and the disjunct distribution of C. aboriginum from the main range of C. serratodens argue for provisionally maintaining it at the rank of species until sufficient specimens are available to permit a reëvaluation of variation. The illustration in K. K. Mackenzie (1940) as C. aboriginum is of another species.

Selected References

None.

Lower Taxa

None.
... more about "Carex aboriginum"
trigonous +
smaller +
beaked +  and spinulose +
papillose +  and smooth +
David F. Murray +
M. E. Jones +
shortened +
cuneate +  and more or less rounded +
bidentate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
v--shaped +
0mm;20mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
papillose +  and smooth +
red +  and purple +
round +  and trigonous +
55 cm550 mm <br />0.55 m <br /> (80 cm800 mm <br />0.8 m <br />) +
spinulose +  and serrulate +
700–1000 m +
hypogynous +  and subtending +
biconvex +  and trigonous +
On well-drained soils of seasonally wet stream banks +
prophyllate +, pedunculate +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
0.3 cm3 mm <br />0.003 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
sessile +, veinless +  and veined +
ascending +  and erect +
0.47 cm4.7 mm <br />0.0047 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.66 cm6.6 mm <br />0.0066 m <br />) +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.34 cm3.4 mm <br />0.0034 m <br />) +
Fruiting early May–Jun. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
scale-like;,;thread-like +
ladder-fibrillose +  and veined +
purple +, tinged red +  and dotted +
Biol. Ser. Bull. State Univ. Montana +
black without yellowbrown +  and brown +
adventitious +
black +  and brown +
basal +  and proximal +
lanceolate +
shorter and narrower +
cylindric +
Illustrated +, Endemic +  and Conservation concern +
pistillate +  and pedunculate +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
elongate;short-oblong +
0.9 cm9 mm <br />0.009 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
2 +  and 3 +
papillate +
deciduous +
2-3(-4)-fid +
Carex sect. Atratae +  and Carex sect. Microrhynchae +
Carex aboriginum +
Carex sect. Racemosae +
species +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
stoloniferous +, rhizomatous +  and long +
plant +  and cespitose +