04-12-13 Phenology Field Note

04-12-13 Phenology Field Note

April 12, 2013

Rebecca Durham's Field Note chronicles the colorful emergence of spring.

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04-12-13 Field Note Rebecca Durham

The yellow umbels of nineleaf biscuitroot and cous biscuitroot mirror the spring sun. (Lomatium triternatum, above, Lomatium cous, below, Native).

Budburst on a warm spring day: saskatoon leaves surpass magenta scales (Amelanchier alnifolia, Whaley). Many shrubs remain dormant, including maple, ninebark, and snowberry. Hairy goldenaster

Diminutive spring draba develops fruit in the form of siliques. This ephemeral non-native species creates carpets of tiny white flowers in early spring (Draba verna, Corral).

The grey-green leaves of arrowleaf balsamroot unfurl. Some individuals on warmer southern slopes display developing flowers (Balsamorhiza sagittata, Whaley).

Specialized glandular cells on the leaf surface of twin arnica secrete a substance sticky to the touch (Arnica sororia, Native). Woodland

At higher elevations where snow lingers, spring stirrings happen later. Near the summit of Mt. Baldy, yellowbell leaves pierce the flattened litter (Fritillaria pudica, Baldy).

At higher elevations where snow lingers, spring stirrings happen later. Near the summit of Mt. Baldy, yellowbell leaves pierce the flattened litter (Fritillaria pudica, Baldy)

As yellowbell flowers mature, the six tepals transition from green to yellow. Some flowers display a red band near the stem and others are uniformly yellow (Fritillaria pudica, Corral). Rebecca Durham

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04-12-13 Phenology Field Note

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