familyAmaranthaceae
genusAlternanthera
speciesAlternanthera flavescens

Alternanthera flavescens

Kunth in A. von Humboldt et al.

in A. von Humboldt et al., Nov. Gen. Sp. 2: 207. 1818.

Steven E. Clemants
Common names: Yellow joyweed
Introduced
Synonyms: Achyranthes ramosissima (Martius) Standley Alternanthera ramosissima (Martius) Chodat
Treatment appears in FNA Volume 4. Treatment on page 448.

Herbs, perennial, 6–15 dm. Stems ascending to spreading, often clambering, pubescent, glabrate. Leaves sessile; blade ovate to lanceolate or elliptic, 1.8–8 × 0.5–3 cm, herbaceous, apex long-acuminate or acute, sparsely strigose or glabrous. Inflorescences terminal and axillary, pedunculate; heads yellowish white, subglobose to cylindric, 0.9–2.5 (–4) × 0.9–1 cm; bracts keeled, less than 1/2 as long as tepals. Flowers: tepals monomorphic, green, lanceolate, 3.4–4.7 mm, apex acute, villous, hairs not barbed; stamens 5; pseudostaminodes ligulate, margins laciniate. Utricles included within tepals, greenish yellow, ellipsoid, 2.5 mm, apex acute. Seeds ovoid, 1.2–1.3 mm.


Phenology: Flowering year-round.
Habitat: Coastal hammocks, thickets, sand bars
Elevation: 0 m

Distribution

V4 879-distribution-map.gif

Introduced; Fla., Mexico, West Indies, South America

Discussion

Alternanthera flavescens has long been known as A. ramosissima (Martius) Standley.

Selected References

None.

Lower Taxa

None.
... more about "Alternanthera flavescens"
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4-locular line character
dehiscence +
Anther architecture or structure in adjective form
2-locular +
Apex pubescence
villous +, glabrous +  and strigose +
Apex shape
acute;acute;acute;long-acuminate +
Author
Steven E. Clemants +
Authority
Kunth in A. von Humboldt et al. +
Blade growth form or texture
herbaceous +
Blade length
1.8 cm18 mm <br />0.018 m <br /> (8 cm80 mm <br />0.08 m <br />) +
Blade margin architecture or shape
entire +
Blade shape
ovate +  and lanceolate or elliptic +
Blade width
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Bract quantity
0 +  and 1/2 +
Bract shape
keeled +
Bract texture
scarious +
Bracteole texture
scarious +
Common name
Yellow joyweed +
Cup height or length or size
short +
Distribution
Fla. +, Mexico +, West Indies +  and South America +
Elevation
0 m +
Embryo position
peripheral +
Filament arrangement
alternating +
Filament fusion
connate +
Flower position
hypogynous +
Flower reproduction
bisexual +
Flower size
minute +  and small +
Fruits utricle condition or texture
dry +
Fruits utricle dehiscence
not +  and dehiscent +
Glomerule arrangement
cluster +
Habitat
Coastal hammocks, thickets, sand bars +
Hair architecture or shape
not barbed +
Head architecture
several-flowered +
Head atypical length
2.5 cm25 mm <br />0.025 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Head coloration
yellowish white +
Head length
0.9 cm9 mm <br />0.009 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Head shape
subglobose +  and cylindric +
Head width
0.9 cm9 mm <br />0.009 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Illustration copyright
Flora of North America Association +
Illustrator
Yevonn Wilson-Ramsey +
Inflorescence architecture
pedunculate +
Inflorescence position
axillary +
Inflorescence position or structure subtype
terminal +
Inflorescences cymule arrangement
arranged +
Introduced
true +
Leaf architecture
sessile +
Leaf arrangement
opposite +
Leaf position
subtending +
Line quantity
1 +
Margin architecture or shape
entire +
Margin shape
laciniate +
Number of lower taxa
0 +
Ovary architecture or structure in adjective form
1-locular +
Ovary position
superior +
Ovule quantity
1 +
Perisperm position relational
surrounding +
Perisperm pubescence or texture
mealy +
Phenology
Flowering year-round. +
Pseudostaminode architecture
ligulate +
Pseudostaminode arrangement
alternating +
Pseudostaminode quantity
5 +
Publication title
in A. von Humboldt et al., Nov. Gen. Sp. +
Publication year
1818 +
Reference
None +
Seed coloration
reddish-brown +
Seed quantity
1 +
Seed shape
ovoid +
Seed size
small +
Seed some measurement
0.12 cm1.2 mm <br />0.0012 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
Source xml
https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V4/V4 879.xml +
Special status
Introduced +
Spike architecture
several-flowered +
Spike shape
cylindric +
Stamen quantity
5 +
Stem growth form or location
floating +
Stem growth form or orientation
decumbent +  and prostrate +
Stem orientation
clambering +, ascending +  and spreading +
Stem pubescence
glabrate +  and pubescent +
Stigma atypical quantity
3 (5) +
Stigma quantity
1;3 +
Stigma shape
2-lobed +  and capitate +
Style presence
absent +
Style quantity
1 +
Style some measurement
0.2 cm2 mm <br />0.002 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Synonyms
Achyranthes ramosissima +  and Alternanthera ramosissima +
Taxon family
Amaranthaceae +
Taxon name
Alternanthera flavescens +
Taxon parent
Alternanthera +
Taxon rank
species +
Tepal architecture
monomorphic +
Tepal atypical quantity
1 (4) +
Tepal coloration
green +
Tepal fusion
distinct +
Tepal presence
absent +
Tepal quantity
5 +
Tepal shape
lanceolate +
Tepal some measurement
0.34 cm3.4 mm <br />0.0034 m <br /> (0.47 cm4.7 mm <br />0.0047 m <br />) +
Tepal texture
indurate +, membranaceous +, chartaceous +  and scarious +
Trichome architecture
simple +
Utricle coloration
greenish yellow +
Utricle dehiscence
indehiscence +
Utricle shape
ellipsoid +
Utricle some measurement
2.5 cm25 mm <br />0.025 m <br /> (?) +
Volume
Volume 4 +
Whole organism duration
perennial +
Whole organism growth form
herb +
Whole organism some measurement
6dm (15dm) +