familyRosaceae
subfamilyRosaceae subfam. Amygdaloideae
tribeRosaceae tribe Spiraeeae
genusPetrophytum
speciesPetrophytum hendersonii

Petrophytum hendersonii

(Canby) Rydberg in N. L. Britton et al.

in N. L. Britton et al., N. Amer. Fl. 22: 253. 1908.

Richard Lis
Common names: Olympic mountain rockmat
Endemic
Basionym: Eriogynia hendersonii Canby Bot. Gaz. 16: 236. 1891 (as hendersoni)
Synonyms: Luetkea hendersonii (Canby) Greene Spiraea hendersonii (Canby) Piper
Treatment appears in FNA Volume 9. Treatment on page 412. Mentioned on page 411, 413.

Shrubs, 2–9 dm diam. Stems decumbent to ascending, 1–10 cm, internodes 0.5–1.5 cm. Leaves: blade narrowly obtrullate, sometimes oblanceolate to spatulate-obovate, 1–2 (–3) × 0.2–0.6 cm, palmately 3-veined, venation visible through hairs, apex acute, abaxial surface sparsely strigose, pilose to pilose-sericeous, sometimes glabrate, sparsely strigose along veins. Panicles densely racemose, 2–5 × 1–2 cm, sparsely sericeous; bracts linear, 2–4 (–6) mm, pilose. Pedicels 2–5 mm; bracteoles 1, rarely extending to base of sepals. Flowers 3–5 mm diam.; hypanthium 0.5–1 mm, sparsely pilose; sepals reflexed, oblong to obtuse, 1–1.5 mm, margins ciliate, abaxial surface sparsely pilose; petals oval, oblong, or obovate, 2–2.5 mm, apex obtuse, sometimes 2-lobate; stamens 25–40, lengths 1–1.3 times petals (2 times sepals); carpels (4–) 5 (–6), abaxially connate. Follicles 1.5–2 mm. 2n = 18.


Phenology: Flowering Jul–Sep.
Habitat: Rock outcrops, cliffs, talus slopes
Elevation: 1000–2300 m

Distribution

V9 695-distribution-map.jpg

Wash.

Discussion

Petrophytum hendersonii is known only from the Olympic Mountains of northwestern Washington.

Selected References

None.

Lower Taxa

None.

"dm" is not declared as a valid unit of measurement for this property.

... more about "Petrophytum hendersonii"
RDF feed
2n chromosome quantity
18 +
Abaxial surface pubescence
pilose +, strigose +, glabrate +  and pilose-sericeous +
Achene arrangement
aggregated +
Androecium position
perigynous +
Anther dehiscence
dehiscent +
Apex shape
2-lobate;obtuse;acute +
Author
Richard Lis +
Authority
(Canby) Rydberg in N. L. Britton et al. +
Bark coloration
gray +, brown +  and dark-brown +
Bark life cycle
aging +
Basal leaf architecture
compound +  and simple +
Basal leaf arrangement
opposite +  and alternate +
Basionyms
Eriogynia hendersonii +
Blade architecture
3-veined +
Blade atypical length
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Blade atypical some measurement
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Blade length
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Blade prominence
visible +
Blade shape
oblanceolate +  and spatulate-obovate +
Blade some measurement
0.2 cm2 mm <br />0.002 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Blade texture
coriaceous +
Blade width
0.2 cm2 mm <br />0.002 m <br /> (?) +  and 0.6 cm6 mm <br />0.006 m <br /> (?) +
Bract arrangement or course or shape
linear +
Bract atypical some measurement
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Bract presence
absent +
Bract pubescence
pilose +
Bract some measurement
0.2 cm2 mm <br />0.002 m <br /> (?) +  and 0.4 cm4 mm <br />0.004 m <br /> (?) +
Bracteole presence
absent +
Bracteole quantity
1 +
Carpel atypical quantity
5 (6) +
Carpel fusion
connate +
Carpel pubescence
hirsute +  and pilose +
Carpel quantity
5 (?) +
Cauline leaf architecture
simple +
Cauline leaf arrangement
alternate +
Common name
Olympic mountain rockmat +
Distribution
Wash. +
Drupe arrangement
not +  and aggregated +
Drupelet arrangement
aggregated +
Elevation
1000–2300 m +
Epicalyx bractlet presence
absent +
Flower architecture or arrangement
compact +
Flower arrangement
aggregated +
Flower density
dense +
Flower diameter
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flower pubescence
canescent +  and sericeous +
Flower reproduction
unisexual +  and bisexual +
Follicle arrangement
aggregated +
Follicle atypical quantity
5 (6) +
Follicle quantity
5 +
Follicle some measurement
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Fruit dehiscence
dehiscent +
Fruit pubescence
pilose +, glabrate +  and glabrous +
Fruit shape
lanceoloid +
Fruit some measurement
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Fruit texture
coriaceous +
Fruits achene arrangement
not +  and aggregated +
Fruits follicle arrangement
not +  and aggregated +
Glomerule arrangement
fascicles +
Habitat
Rock outcrops, cliffs, talus slopes +
Hypanthium architecture or function or pubescence
glandular +
Hypanthium duration
persistent +
Hypanthium pubescence
pilose +
Hypanthium shape
turbinate +  and hemispheric +
Hypanthium some measurement
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Illustration copyright
Flora of North America Association +
Illustrator
Marjorie C. Leggitt +
Inflorescence architecture
10-100-flowered +
Inflorescence position
axillary +
Inflorescence position or structure subtype
terminal +
Integument architecture
crassinucellate +
Integument quantity
2 +
Internode some measurement
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Leaf architecture
compound +  and simple +
Leaf arrangement
alternate +
Leaf condition
marcescent +
Leaf duration
persistent +
Long-shoot height or length or size
short +
Long-shoot presence
absent +
Margin architecture
1-3-veined +
Margin architecture or pubescence or shape
ciliate +
Margin architecture or shape
entire +
Margin prominence
indistinct +
Margin prominence or shape
flat +
Margin shape
entire +  and crenulate +
Nectar disc presence
absent +
Number of lower taxa
0 +
Nutlet arrangement
aggregated +
Ovary position
inferior +  and superior +
Ovule arrangement
biseriate +  and clustered +
Ovule arrangement or growth form
clustered +
Ovule atypical quantity
2 (5) +
Ovule position
collateral +  and apical +
Ovule quantity
3 +  and 2 +
Panicle architecture
branched +
Panicle arrangement
racemose +
Panicle length
2cm +  and 5cm +
Panicle pubescence
sericeous +
Panicle size or width
narrow +
Panicle width
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Pedicel presence
absent +
Pedicel some measurement
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Perianth position
perigynous +
Petal atypical quantity
0 (?) +  and 4 (?) +
Petal coloration
white +
Petal duration
persistent +
Petal fusion
free +  and distinct +
Petal life cycle
withering +
Petal quantity
5 +
Petal shape
obovate;oblong;obovate;oblong;oval +
Petal some measurement
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Petiole presence
absent +
Phenology
Flowering Jul–Sep. +
Pistil atypical quantity
250 (450) +
Pistil fusion
adnate +, free +, connate +  and distinct +
Pistil quantity
1;250 +
Publication title
in N. L. Britton et al., N. Amer. Fl. +
Publication year
1908 +
Reference
None +
Seed architecture
not arillate +
Seed atypical quantity
2 (12) +
Seed quantity
2;1 +
Seed shape
list;count +
Sepal atypical quantity
5 (10) +
Sepal duration
persistent +
Sepal fusion
free +  and distinct +
Sepal orientation
reflexed +
Sepal quantity
5 +
Sepal shape
oblong +  and obtuse +
Sepal some measurement
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Short-shoot pubescence
glabrous +
Source xml
https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V9/V9 695.xml +
Special status
Endemic +
Stamen atypical quantity
130 (220) +
Stamen fusion
free +  and distinct +
Stamen length
1-1.3 times petals +
Stamen length or size
longer +
Stamen quantity
25;40 +
Stamen variability
equal +
Stem architecture
branched +  and simple +
Stem growth form or orientation
prostrate +
Stem orientation
decumbent +  and ascending +
Stem some measurement
1 cm10 mm <br />0.01 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Stigma architecture or shape
capitate +
Stigma size
minute +
Stipule architecture
palmate +
Stipule architecture or shape
pinnate +
Stipule presence
absent +
Style duration
persistent +  and deciduous +
Style fusion
distinct +
Style position
basal +, lateral +, subterminal +  and terminal +
Style position or structure subtype
terminal +
Style shape
not elongate +
Surface pubescence
sericeous +, pilose +, canescent +, strigose +  and glabrate +
Synonyms
Luetkea hendersonii +  and Spiraea hendersonii +
Taxon family
Rosaceae +
Taxon name
Petrophytum hendersonii +
Taxon parent
Petrophytum +
Taxon rank
species +
Torus development
developed +
Torus presence
absent +
Torus prominence
inconspicuous +
Torus size
thickened +  and minute +
Torus size or width
thickened +
Volume
Volume 9 +
Whole organism architecture
unarmed +
Whole organism duration
perennial +
Whole organism growth form
shrub +
Whole organism some measurement
0.1dm (10dm) +
X chromosome quantity
9 +