Ambrosia linearis

(Rydberg) W. W. Payne

J. Arnold Arbor. 45: 425. 1964.

Endemic
Basionym: Gaertneria linearis Rydberg Bull. Torrey Bot. Club 32: 133. 1905
Treatment appears in FNA Volume 21. Treatment on page 17. Mentioned on page 11.

Perennials or subshrubs, 20–40+ cm. Stems erect. Leaves mostly alternate; petioles 0; blades mostly linear (some 1-pinnate, lobes linear), 12–20 (–35+) × 1 (–2+) mm, bases cuneate, margins entire, abaxial faces strigillose (whitish), adaxial faces scabrellous. Pistillate heads clustered, proximal to staminates; florets 1. Staminate heads: peduncles 0.5–1 mm; involucres cupshaped (with black nerves), 4–6+ mm diam., strigillose; florets 12–20+. Burs: bodies pyriform to obconic, 2–4 (–5) mm, strigillose, spines (4–) 5–9 (–13+), scattered or mostly distal, subulate, (0.8–) 1–1.5 mm, tips usually uncinate.


Phenology: Flowering Jul.
Habitat: Seasonally wet, sandy soils
Elevation: 2000–2100 m

Discussion

Ambrosia linearis is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References

None.

Lower Taxa

None.
... more about "Ambrosia linearis"
not tailed +, rounded +  and obtuse +
coherent +  and distinct +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
spiciform +, racemiform +, paniculiform +, glomerate +  and corymbiform +
indeterminate +  and determinate +
John L. Strother +
(Rydberg) W. W. Payne +
cuneate +
Gaertneria linearis +
compound +  and simple +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (2 cm20 mm <br />0.02 m <br />) +
lobed;rhombic;ovate;rhombic;ovate;obovate;linear;lanceolate;filiform;elliptic;deltate +
winged;ribbed;winged;ribbed +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
strigillose +
tuberculate +  and rugose +
pyriform;obconic +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
barbellulate +  and barbellate +
purplish +  and whitish +
villous +, strigillose +, hispidulous +, glabrous +  and warty +
tuberculate +
globose +  and obovoid pyramidal pyriform obconic or fusiform +
fertile +  and bisexual +
2000–2100 m +
stipitate-glandular +, glabrate +  and hairy +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Seasonally wet, sandy soils +
staminate +  and pistillate +
in corymbiform , glomerate , paniculiform , racemiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
membranous +  and scarious +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
cup-shaped +
conspicuous +
petiolate +  and sessile +
incurved;erect +
deltate +
connate +  and distinct +
2-carpellate +
stipitate-glandular +, hirtellous +  and villous +
spatulate;linear +
membranous +
persistent +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Flowering Jul. +
5 +  and 16 +
unequal +  and subequal +
J. Arnold Arbor. +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
exalbuminous +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
5 (?) +  and 9 (?) +
subulate +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
prostrate +  and decumbent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Franseria +  and Hymenoclea +
Ambrosia linearis +
Ambrosia +
species +
campanulate +  and cylindric +
uncinate +
toothed +  and entire +
20 cm200 mm <br />0.2 m <br /> (40 cm400 mm <br />0.4 m <br />) +