Dissanthelium californicum

(Nutt.) Benth.
Common names: California dissanthelium
Treatment appears in FNA Volume 24. Treatment on page 700.

Plants annual. Culms to 25 cm, glabrous. Blades 2.5-15 cm long, 1-4 mm wide, flat, soft. Panicles 5-15 cm, contracted; pedicels scabrous. Spikelets with 2-3 florets, lower floret in each spikelet a little longer than the upper floret. Glumes subequal, 3-4 mm, exceeding the florets, lanceolate, keels scabrous, margins scarious, apices acuminate; lemmas 1.5-2 mm, pilose, obtuse to acute. 2n = unknown.

Discussion

Dissanthelium californicum is known only from Santa Catalina and San Clemente islands, California, and Guadalupe Island, Baja California, Mexico. It grows in coastal sage-scrub. Until its rediscovery on Santa Catalina Island in 2005, it was thought to be extinct in California, not having been reported from the state since 1903.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

membranous +  and scarious +
acuminate +
Nancy F. Refulio +
(Nutt.) Benth. +
1 (?) +  and 3 (?) +
straight +
basal +  and terminal +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
2.5 cm25 mm <br />0.025 m <br /> (15 cm150 mm <br />0.15 m <br />) +
not evident +
cross +, linear +  and narrowly lanceolate +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
spikelike +
1 cm10 mm <br />0.01 m <br /> (?) +
California dissanthelium +
not branching +
ascending +  and erect +
0 cm0 mm <br />0 m <br /> (25 cm250 mm <br />0.25 m <br />) +
not woody +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
2 +  and 3 +
bisexual +  and some +
compressed +
reduced +
shorter or longer +
subtending +
lanceolate +
subequal +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
uncinate +
pilose +, scabrous +  and glabrous +
obtuse +  and acute +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
membranous +
inconspicuous +
lanceolate +
concealed +  and prominent +
2 +  and 1 +
hairy +  and glabrous +
well-developed +
2-keeled +
spikelike +
5 cm50 mm <br />0.05 m <br /> (15 cm150 mm <br />0.15 m <br />) +
dry +  and fleshy +
1 +  and 60 +
compressed +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
1 +  and 3 +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Dissanthelium californicum +
Dissanthelium +
species +
membranous +
parallel +  and converging +
aquatic +  and terrestrial +