E-Flora BC: Electronic Atlas of the Flora of British Columbia

Antennaria microphylla Rydb.
white pussytoes (littleleaf pussytoes)
Asteraceae (Aster family)

Introduction to Vascular Plants

© Curtis Bjork  Email the photographer   (Photo ID #22825)

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Distribution of Antennaria microphylla
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Species Information

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General:
Perennial herb, mat-forming with numerous leafy stolons 1-6 cm long; stems erect, several, branched above, densely woolly-hairy and glandular above, 8-40 cm tall.
Leaves:
Basal leaves spoon-shaped to broadly lance-shaped, grey to white woolly-hairy above and below, 6-30 mm long, 2-8 mm wide, abruptly sharp-pointed, with a sharp, slender tip; stem leaves similar, 5-30 mm long, linear to lanceolate, abruptly sharp-pointed.
Flowers:
Heads several to many in compact, rounded cluster; involucres of 2 types, the female ones 5.5-7.0 mm tall, hairy at the base, the male ones similar, 5.0-6.5 mm tall; involucral bracts lanceolate, the upper papery portion white to light yellow, often greenish at the base; female flowers 3.0-4.5 mm long, male flowers 2.5-3.0 mm long.
Fruits:
Female achenes 0.6-1.2 mm long, glabrous or sparingly warty, the pappus white with hairlike bristles, 3-5 mm long; male pappus hairs club-shaped and toothed at the the tips, 3-4 mm long.
Notes:
In recent years, some taxonomists (e.g., Hitchcock and Cronquist 1973; Douglas et al. 1989, 1995) merged both A. nitida and A. rosea with A. microphylla. Bayer and Stebbins (1993), however, have separated the latter from A. rosea. Upon examining hundreds of herbaria sheets of A. microphylla (which included those recognized by Bayer and Stebbins [1993] as A. rosea) at the Royal BC Museum, it appears that of all the plants which had white or yellowish-white (as stated in Bayer [1996]) involucral bracts, only a small percentage had glands on the upper stems. Therefore, A. microphylla as circumscribed by Bayer and Stebbins (1993) is infrequent in BC.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
White
Blooming Period:
Mid Spring
Fruit/Seed characteristics:
Colour: Brown
Present from Spring to Summer
Source:  The USDA

Habitat / Range

Mesic to dry slopes and open forests from the lowland to the alpine zones; infrequent throughout BC, except absent on N Vancouver Island and the Queen Charlotte Islands; N to AK, YT and NT, E to PQ and S to NM.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Antennaria microphylla

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class

Minimum

Average

Maximum

Elevation (metres) 170 1195 2470
Slope Gradient (%) 0 25 360
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 196 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 7
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
1552
Modal BEC Zone Class
IDF
All BEC Zones (# of stations/zone) species was recorded in: AT(6), BAFA(6), BG(83), BWBS(13), ESSF(286), ICH(44), IDF(589), IMA(2), MH(1), MS(207), PP(171), SBPS(35), SBS(47), SWB(6)

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Antennaria bracteosa Rydb.
Antennaria nitida Greene
Antennaria parvifolia Nutt.
Antennaria parvifolia var. bracteosa (Rydb.) A. Nelson
Antennaria rosea var. nitida (Greene) Breitung
Antennaria solstitialis Lunell

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References