Amaranthus torreyi

(A. Gray) S. Watson in W. H. Brewer et al.

in W. H. Brewer et al., Bot. California 2: 42. 1880.

Common names: Torrey’s amaranth Bigelow’s amaranth
WeedyEndemic
Basionym: Amblogyna torreyi A. Gray Proc. Amer. Acad. Arts 5: 167. 1861 (as Amblogyne)
Synonyms: Amblogyna bigelovii Uline & W. L. Bray Amaranthus pringlei S. Watson Sarratia berlandieri var. emarginata Torrey
Treatment appears in FNA Volume 4. Mentioned on page 427.

Plants glabrescent to sparsely pubescent. Stems erect or ascending proximally, much-branched especially near base, 0.1–0.7 m. Leaves: petiole less than 1/2 as long as blade; blade oblanceolate or lanceolate to ovatelanceolate, (1.2–) 1.5–5 (–7) × 0.3–2 cm, base narrowly cuneate to cuneate, margins entire, plane or slightly undulate, apex acute to subobtuse, mucronulate. Inflorescences axillary clusters, toward apex aggregated in spikes (rarely spicate panicles), axes, leafy (occasionally almost leafless distally). Bracts lanceolate to linear-subulate, 1.3–3.5 mm, slightly longer than tepals. Pistillate flowers: tepals 5, spatulate to narrowly spatulate, clawed, equal or subequal, 1.5–2.5 mm, margins entire, apex obtuse, rounded, or slightly emarginate; style-branches erect; stigmas 3. Staminate flowers: mostly at tips of inflorescences; tepals 5, equal or subequal; stamens 3 (–5). Utricles obovoid to subglobose-obovoid, 1.5–2 mm, nearly equaling or slightly shorter than tepals, smooth, dehiscence regularly circumscissile. Seeds black, subglobose to broadly lenticular, 1 mm diam., smooth, shiny.


Phenology: Flowering summer–fall.
Habitat: Sandy, rocky, and gravelly flats, slopes, canyons, washes, other naturally disturbed habitats
Elevation: 1000-1700 m

Distribution

Ariz., Calif., N.Mex., Tex., Mexico

Discussion

The name Amaranthus torreyi has been widely misapplied to at least two other species, 7. A. arenicola and 6. A. watsonii. Because of that, the name A. bigelovii was used for A. torreyi by J. D. Sauer (1955) and in some recent floras. Sometimes A. torreyi (California and Arizona) and A. bigelovii (New Mexico and Texas) are recognized as separate species. The nomenclature and taxonomic relationships in this group should be critically reviewed based on type specimens and additional experimental and field studies.

Selected References

None.

Lower Taxa

None.
... more about "Amaranthus torreyi"
emarginate;rounded;emarginate;rounded;obtuse;mucronulate;acute;subobtuse +
Sergei L. Mosyakin +  and Kenneth R. Robertson +
(A. Gray) S. Watson in W. H. Brewer et al. +
narrowly cuneate +  and cuneate +
Amblogyna torreyi +
5 cm50 mm <br />0.05 m <br /> (7 cm70 mm <br />0.07 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (5 cm50 mm <br />0.05 m <br />) +
lanceolate +  and ovatelanceolate +
0.3 cm3 mm <br />0.003 m <br /> (2 cm20 mm <br />0.02 m <br />) +
persistent +
slightly longer +
lanceolate +  and linear-subulate +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
Torrey’s amaranth +  and Bigelow’s amaranth +
Ariz. +, Calif. +, N.Mex. +, Tex. +  and Mexico +
1000-1700 m +
peripheral +
staminate +  and pistillate +
hypogynous +
minute +  and small +
not +  and dehiscent +
Sandy, rocky, and gravelly flats, slopes, canyons, washes, other naturally disturbed habitats +
reduced +
undulate +, plane +  and entire +
scarious +  and membranaceous +
cylindric +
0 +  and 1/2 +
Flowering summer–fall. +
rudimentary +
in W. H. Brewer et al., Bot. California +
subglobose +  and broadly lenticular +
Weedy +  and Endemic +
cylindric +
much-branched +
prostrate +  and decumbent +
ascending +  and erect +
10 cm100 mm <br />0.1 m <br /> (70 cm700 mm <br />0.7 m <br />) +
not fleshy +
slender +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Amblogyna bigelovii +, Amaranthus pringlei +  and Sarratia berlandieri var. emarginata +
Amaranthus torreyi +
Amaranthus subg. Amaranthus +
species +
distinct +
clawed +, spatulate +  and narrowly spatulate +
subequal +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
indurate +, membranaceous +, chartaceous +  and scarious +
walled +  and 3(-5)-veined +
circumscissile +
tuberculate +  and rugose +
obovoid +  and subglobose-obovoid +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
membranaceous +
glabrescent +  and sparsely pubescent +