Senecio hydrophilus

Nuttall

Trans. Amer. Philos. Soc., n. s. 7: 411. 1841.

Endemic
Synonyms: Senecio hydrophilus var. pacificus Greene
Treatment appears in FNA Volume 20. Treatment on page 557. Mentioned on page 547.

Perennials (biennials?), 40–100 (–200) cm (caudices foreshortened, roots fleshy-fibrous). Herbage (often sea-green, usually glaucous) glabrous. Stems single or 2–4 loosely clustered. Leaves progressively reduced distally; ± petiolate; blades elliptic to oblanceolate, 5–20+ × (1–) 2–10 cm, bases tapered, margins denticulate or entire (mid and distal leaves sessile, bractlike). Heads 20–40 (–80+) in compound corymbiform arrays. Calyculi of 2–4+ bractlets (less than 2 mm). Phyllaries ± 8 or ± 13, 5–8 mm, tips frequently black. Ray-florets (0) ca. 5; corolla laminae 3–5 mm. Cypselae glabrous. 2n = 40.


Phenology: Flowering spring–early summer.
Habitat: Marshes, swampy places, standing water, alkaline sites
Elevation: (0–)200–2500 m

Distribution

V20-1236-distribution-map.gif

B.C., Calif., Colo., Idaho, Mont., Nev., Oreg., S.Dak., Utah, Wash., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Senecio hydrophilus"
not tailed +, rounded +  and obtuse +
papillate +
scarious +
usually ovate +  and lance-linear +
corymbiform +  and compound +
indeterminate +  and determinate +
Theodore M. Barkley† +
Nuttall +
tapered +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
5 cm50 mm <br />0.05 m <br /> (20 cm200 mm <br />0.2 m <br />) +
elliptic;oblanceolate +
2cm;10cm +
winged;nerved;ribbed +
barbellulate +  and smooth +
white +  and stramineous +
purplish +, reddish +, white +, ochroleucous +, yellow +  and white rarely reddish +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
angled +, 5-ribbed +, prismatic +  and cylindric +
fertile +  and bisexual +
fertile +  and bisexual +
B.C. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, Oreg. +, S.Dak. +, Utah +, Wash. +  and Wyo. +
(0–)200–2500 m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Marshes, swampy places, standing water, alkaline sites +
discoid +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
turbinate;campanulate +
cauline +  and basal +
reduced +
erect;recurved +
deltate +
dentate to pinnatifid +  and entire +
entire +  and denticulate +
2-carpellate +
persistent +
Flowering spring–early summer. +
mostly oblong +  and lanceolate or linear +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Trans. Amer. Philos. Soc., n. s. +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
exalbuminous +
2 +  and 4 +
appendaged +  and truncate +
papillate +
Senecio hydrophilus var. pacificus +
Senecio hydrophilus +
species +
campanulate +
denticulate +  and serrate or toothed +
100 cm1,000 mm <br />1 m <br /> (200 cm2,000 mm <br />2 m <br />) +
40 cm400 mm <br />0.4 m <br /> (100 cm1,000 mm <br />1 m <br />) +
shrub +  and subshrub +