Helianthella uniflora (Nutt.) Torr. & A. Gray
Rocky Mountain helianthella (oneflower helianthella; one-flowered little sunflower)
Asteraceae (Aster family)
Introduction to Vascular Plants
Rocky Mountain helianthella (oneflower helianthella; one-flowered little sunflower)
Asteraceae (Aster family)
Introduction to Vascular Plants
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SUBTAXA PRESENT IN BC
Helianthella uniflora var. douglasii
Species Information
General:
Perennial herb from a taproot and branching stem-base; stems erect or ascending, simple or several, harshly stiff-hairy to spreading-hairy or smooth below, 0.2-1 m tall.
Leaves:
Basal leaves soon deciduous; middle and upper leaves opposite, simple, entire, roughened, lanceolate or elliptic, more or less 3-nerved, up to 15 cm long, 5 cm wide; lowermost leaves oblanceolate and smaller than those above.
Flowers:
Heads with ray and disk flowers, solitary; involucral bracts lance-linear, often pointed, stiff-hairy, also with marginal hairs; ray flowers bright yellow, 13-21, 2-4.5 cm long; disk flowers yellow; involucres 12-15 mm tall.
Fruits:
Achenes strongly compressed, wing-margined, finely-appressed-hairy; pappus of 2 upwardly hairy, unequal awns.
USDA Species Characteristics
Flower Colour:
Yellow
Blooming Period:
Spring
Fruit/Seed characteristics:
Colour: Brown
Present from Summer to Fall
Source: The USDA
Ecology
Ecological Framework for Helianthella uniflora
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)
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 |
||
|
Avg |
Min |
Max |
|
| Elevation
(metres) |
987 | 545 | 1587 |
| Slope
Gradient (%) |
32 | 0 | 68 |
|
Aspect (degrees) |
187 | 90 | 226 |
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
3 | 1 | 7 |
| Modal
Nutrient Regime
Class |
D | ||
| #
of field plots species was recorded in: |
4 | ||
| Modal
BEC Zone Class |
MS | ||
|
All BEC Zones (# of stations/zone) species was recorded in |
BG(1), IDF(1), MS(1), SBS(1) | ||
|
Source:
Klinkenberg 2013
|
|||