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Delphinium viridescens is local in mountains southwest of Wenatchee, Washington. Flowering season for the Wenatchee larkspur is in the summer, most notably in July. Peak anthesis occurs during mid-summer (July). Fruits mature and begin dispersal by late September.<ref>Delphinium viridescens : Wenatchee Larkspur, [http://www1.dnr.wa.gov/nhp/refdesk/fguide/pdf/devi.pdf PDF] (Accessed 2010).</ref> The Wenatchee larkspur plant is located mostly in wet meadows and stream sides in coniferous forest, heavy clay soils.<ref>[[University of Washington]]. [http://biology.burke.washington.edu/herbarium/imagecollection.php?ID=3709 WTU Herbarium Image Collection], Burke Museum of Natural History and Culture, (2010).</ref> Wenatchee larkspur is a stout perennial from a short rhizome, 2-4 feet fall, glabrous below but with copious stalked, yellow glands above and throughout the inflorescence. The stem is hollow.  

Delphinium viridescens is local in mountains southwest of Wenatchee, Washington. Flowering season for the Wenatchee larkspur is in the summer, most notably in July. Peak anthesis occurs during mid-summer (July). Fruits mature and begin dispersal by late September.<ref>Delphinium viridescens : Wenatchee Larkspur, [http://www1.dnr.wa.gov/nhp/refdesk/fguide/pdf/devi.pdf PDF] (Accessed 2010).</ref> The Wenatchee larkspur plant is located mostly in wet meadows and stream sides in coniferous forest, heavy clay soils.<ref>[[University of Washington]]. [http://biology.burke.washington.edu/herbarium/imagecollection.php?ID=3709 WTU Herbarium Image Collection], Burke Museum of Natural History and Culture, (2010).</ref> Wenatchee larkspur is a stout perennial from a short rhizome, 2-4 feet fall, glabrous below but with copious stalked, yellow glands above and throughout the inflorescence. The stem is hollow.  

* Leaves: Basal and lower cauline leaves long-petiolate, the blades up to 10 cm. broad, divided into three main wedge-shaped lobes, these once or twice cleft into oblong-rounded segments; mid-cauline leaves short-petiolate and overlapping, nearly erect, divided into narrow, acute segments, abruptly transitional to the lower leaves, but gradually transitional to the linear, entire, bract-like upper leaves.

* [[Leaves]]: Basal and lower cauline leaves long-petiolate, the blades up to 10 cm. broad, divided into three main wedge-shaped lobes, these once or twice cleft into oblong-rounded segments; mid-cauline leaves short-petiolate and overlapping, nearly erect, divided into narrow, acute segments, abruptly transitional to the lower leaves, but gradually transitional to the linear, entire, bract-like upper leaves.

* Flowers: Inflorescence usually a simple, narrow raceme, the pedicels shorter than the flowers; sepals 5, purplish, but strongly streaked with yellow or greenish-yellow, oblanceolate, glandular, 7-11 mm. long; spur thick, straight, 7-10 mm. long; petals 4, yellowish or purple, the lower pair densely soft-hairy, equaling the sepals; stamens numerous; pistils 3.

* [[Flowers]]: Inflorescence usually a simple, narrow raceme, the pedicels shorter than the flowers; sepals 5, purplish, but strongly streaked with yellow or greenish-yellow, oblanceolate, glandular, 7-11 mm. long; spur thick, straight, 7-10 mm. long; petals 4, yellowish or purple, the lower pair densely soft-hairy, equaling the sepals; stamens numerous; pistils 3.

* Fruit: Follicles 6-8 mm. long, erect, densely glandular-pubescent.

* [[Fruit]]: Follicles 6-8 mm. long, erect, densely glandular-pubescent.

The lower leaves of the Wenatchee larkspur are approximately four inches broad and are divided into 3-5 main lobes, each further dissected.  The upper leaves on the Wenatchee larkspur are [[linear]] and entire or linearly lobed. The diagnostic features include dense yellow hairs on the upper stem and flower cluster and yellowish to purple petals, and purplish sepals that are predominantly streaked with yellow.<ref>http://www.conservapedia.com/File:Wenatchee_Larkspur.jpg</ref>  The long spur of the Wenatchee larkspur flowers is generally reddish-purple, although some are pale greenish-yellow.

The lower leaves of the Wenatchee larkspur are approximately four inches broad and are divided into 3-5 main lobes, each further dissected.  The upper leaves on the Wenatchee larkspur are [[linear]] and entire or linearly lobed. The diagnostic features include dense yellow hairs on the upper stem and flower cluster and yellowish to purple petals, and purplish sepals that are predominantly streaked with yellow.<ref>http://www.conservapedia.com/File:Wenatchee_Larkspur.jpg</ref>  The long spur of the Wenatchee larkspur flowers is generally reddish-purple, although some are pale greenish-yellow.