familyAsteraceae
tribeAsteraceae tribe Cichorieae
genusHieracium
speciesHieracium megacephalon

Hieracium megacephalon

Nash

Bull. Torrey Bot. Club 22: 152. 1895.

John L. Strother
Synonyms: Hieracium argyraeum Small
Treatment appears in FNA Volume 19. Treatment on page 286. Mentioned on page 280.

Plants ca. 40 cm. Stems proximally piloso-hirsute (hairs 1–4+ mm) and stellate-pubescent, distally piloso-hirsute and/or stellate-pubescent. Leaves: basal 4–6, cauline (1–) 3–4+; blades elliptic to obovate, 35–80 (–120) × 15–30 (–40+) mm, lengths 2–4+ times widths, bases cuneate to rounded (sometimes ± clasping), margins entire or denticulate, apices rounded to obtuse, abaxial faces piloso-hirsute (hairs 1.5–4 mm), sometimes stellate-pubescent as well, adaxial piloso-hirsute. Heads (12–) 20–50+ in open, corymbiform arrays (lengths of arrays ± 2 times diams.). Peduncles stellate-pubescent and stipitate-glandular. Calyculi: bractlets 5–12+. Involucres campanulate, 8–11 mm. Phyllaries 9–13+, apices acute to acuminate, abaxial faces stellate-pubescent and stipitate-glandular. Florets 20–50+; corollas yellow, 10–12+ mm. Cypselae urceolate, 3.5–4+ mm; pappi of 32–40+, white to stramineous bristles in 1–2+ series, 5–6.5 mm.


Phenology: Flowering (Jan–)Apr–May(–Oct).
Habitat: Limestone hammocks, pine woods, sands
Elevation: 0–10+ m

Distribution

V19-397-distribution-map.gif

Fla., Ga., S.C.

Discussion

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Hieracium megacephalon"
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Abaxial face pubescence
stipitate-glandular +, stellate-pubescent +  and piloso-hirsute +
Adaxial face pubescence
piloso-hirsute +
Anther base shape
tailed +
Anther dehiscence
introrse +
Anther fusion
connate +
Apex shape
acute;acuminate +
Apex texture
scarious +
Apical appendage development
developed +
Apical appendage shape
ovate +  and lanceolate +
Appendage presence
absent +
Appendage pubescence
hirsute +
Appendage relief
papillate +
Array architecture
corymbiform +  and open +
Array development
indeterminate +  and determinate +
Author
John L. Strother +
Authority
Nash +
Awn pappus duration
persistent +
Awn pappus life cycle
falling +
Band architecture
continuous +
Band quantity
1 +
Basal leaf quantity
4;6 +
Base shape
cuneate +  and rounded +
Blade architecture
compound +  and simple +
Blade atypical length
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
Blade atypical width
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Blade l w ratio
2-4+ +
Blade length
3.5 cm35 mm <br />0.035 m <br /> (8 cm80 mm <br />0.08 m <br />) +
Blade shape
elliptic;obovate +
Blade width
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Body architecture
winged +
Body architecture or shape
ribbed +
Body relief
tuberculate +, rugose +, muricate +  and smooth +
Bractlet atypical quantity
13 (16) +
Bractlet quantity
5;12 +
Bractlet shape
deltate;lanceolate or linear +
Branch fragility or size
stout +
Branch shape
filiform +
Branch structure in adjective form
stigmatic +
Bristle architecture
barbellulate +
Bristle coloration
white +  and stramineous +
Bristle fusion
distinct +
Bristle quantity
32;40 +
Bristle relief
coarse +
Bristle shape
Plumose (?) +
Bristle size
unequal +
Bristle variability
equal +
Calyculus presence
absent +
Calyculus quantity
Of 3-13(-16+) , deltate to lanceolate or linear bractlets (?) +
Cauline leaf atypical quantity
1 (3) +
Cauline leaf quantity
3 (?) +  and 4 (?) +
Corolla architecture
zygomorphic +, actinomorphic +  and (3-)5-merous +
Corolla coloration
yellow +
Corolla some measurement
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Cypsela architecture
monomorphic +
Cypsela architecture or shape
beaked +
Cypsela coloration
black +  and redbrown +
Cypsela shape
urceolate +
Cypsela some measurement
3.5mm;4mm +
Distribution
Fla. +, Ga. +  and S.C. +
Elevation
0–10+ m +
Embryo course
straight +
Face pubescence
glabrous +
Filament fusion
distinct +
Floret architecture
ligulate +
Floret atypical quantity
5;15 +
Floret position
proximal +
Floret quantity
20;50 +
Floret reproduction
bisexual +
Fruit architecture
winged +  and beaked +
Fruit condition or texture
dry +
Fruit density
dispersed +
Habitat
Limestone hammocks, pine woods, sands +
Head architecture
subsessile +
Head arrangement
in corymbiform , paniculiform , thyrsiform , umbelliform or nearly racemiform , arrays +  and singly +
Head atypical quantity
12 (20) +
Head development
indeterminate +
Head quantity
20;50 +
Head reproduction
homogamous +
Illustration copyright
Flora of North America Association +
Illustrator
Barbara Alongi +
Individual head architecture
each +  and sessile +
Involucre diameter
0.3 cm3 mm <br />0.003 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
Involucre position relational
surrounding +
Involucre shape
campanulate +
Involucre some measurement
0.8 cm8 mm <br />0.008 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
Leaf architecture
sessile +  and petiolate +
Leaf arrangement
alternate +
Leaf position
cauline +  and basal +
Margin architecture
prickly +
Margin architecture or shape
entire +
Margin shape
denticulate +  and entire +
Margin texture
scarious +
Number of lower taxa
0 +
Ovary architecture
2-carpellate +
Ovary architecture or structure in adjective form
1-locular +
Ovary position
inferior +
Ovule fixation
attached +
Ovule orientation
anatropous +
Ovule quantity
1 +
Pappus duration
persistent +
Pappus some measurement
0.5 cm5 mm <br />0.005 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
Peduncle architecture
bracteate +
Peduncle pubescence
stipitate-glandular +  and stellate-pubescent +
Peduncle shape
not inflated +
Pericarp fragility
tough +
Pericarp width
thick +
Petal fusion
connate +
Phenology
Flowering (Jan–)Apr–May(–Oct). +
Phyllary atypical quantity
21 (40) +
Phyllary duration
persistent +
Phyllary fusion
connate +  and distinct +
Phyllary quantity
9 +  and 13 +
Phyllary shape
Lanceolate (Linear) +
Phyllary size
subequal +  and unequal +
Phyllary variability
equal +
Publication title
Bull. Torrey Bot. Club +
Publication year
1895 +
Receptacle architecture
epaleate +
Receptacle prominence or shape
flat +
Receptacle pubescence
glabrous +
Receptacle relief
pitted +
Receptacle shape
flat;convex +
Reference
None +
Rib quantity
10 +
Root texture
fibrous +
Seed architecture
exalbuminous +
Seed quantity
1 +
Sepal variability
modifed +
Series atypical quantity
5 (15) +
Series quantity
1;2 +
Source xml
https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V19-20-21/V19 397.xml +
Stamen arrangement
alternate +
Stamen atypical quantity
4 (5) +
Stamen quantity
5 +
Stem architecture
branched +
Stem orientation
erect +
Stem pubescence
stellate-pubescent +  and piloso-hirsute +
Stem quantity
1 +
Stem shape
scapiform +
Style-branch architecture
appendaged +  and truncate +
Style architecture
2-branched +
Style pubescence
hirsute +
Style quantity
1 +
Style relief
papillate +
Synonyms
Hieracium argyraeum +
Taxon family
Asteraceae +
Taxon name
Hieracium megacephalon +
Taxon parent
Hieracium +
Taxon rank
species +
Volume
Volume 19 +
Whole-organism architecture
taprooted +
Whole-organism atypical some measurement
5 cm50 mm <br />0.05 m <br /> (20 cm200 mm <br />0.2 m <br />) +
Whole-organism duration
perennial +
Whole-organism some measurement
20 cm200 mm <br />0.2 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
Whole organism growth form
plant +
Whole organism some measurement
40 (?) +
X chromosome quantity
9 +