Delphinium nuttallii

From Puget Prairie Plants
Revision as of 12:18, 8 May 2012 by Evaeli22 (Talk | contribs) (Propagation)

First overview block:Delphinium nuttallianum Pritz. ex Walp, Ranunculaceae, Delphinium nelsonii Greene, Upland larkspur, Low larkspur, Yellow pine larkspur DENU.jpg


  • Kingdom Plantae – Plants
  • Subkingdom Tracheobionta – Vascular plants
  • Superdivision Spermatophyta – Seed plants
  • Division Magnoliophyta – Flowering plants
  • Class Magnoliopsida – Dicotyledons
  • Subclass Asteridae
  • Order Asterales
  • Family Asteraceae –
  • Genus Agoseris Raf. –
  • Species Agoseris grandiflora (Nutt.) Greene –


General: Crisp-puberulent, eglandular perennial from small, globose, fleshy roots, the single stems 3-6 dm. tall. Leaves: Leaves long-petiolate, evenly distributed, the blades up to 10 cm. broad, 3-4 times dissected into narrowly lanceolate or linear segments. Flowers: Inflorescence simple to compound, the racemes spike-like above, the lower pedicels exceeding the numerous, crowded flowers; sepals 5, deep bluish-purple, 7-12 mm. long, slightly spreading, with a conspicuous median, pubescent, greenish band; spur equal to the sepals; petals 4, small, the lower pair deep purplish-blue, shallowly cleft, the upper pair light blue; stamens numerous; pistils 3. Fruit: Follicles about 15 mm. long, slightly bent.

Bloom Period


Pierce and eastern Grays Harbor Counties, Washington, south to the Columbia River Gorge and Clackamas County, Oregon.


Ecological Setting-Gravelly outwash prairies and basaltic cliffs.


Landscaping-Not very easy to grow, but looks like it will reseed itself.


Extended cold, moist stratification is needed. Cool spring temperatures may also be necessary. In trials at the Pullman PMC, no germination occurred without stratification and no seed germinated after 30 days cold, moist stratification. Seed sown in late December and left outside did not germinate the first season, but germinated well after a second winter. Seed sown outdoors in November will germinate the following spring. Seedlings which germinated outside died when placed in the greenhouse.


Abbreviation: DENU

Seed sample from: 2011

Average Measurement: 1.8 x 1.2 x 0.8

Measurement Range: L: 1.25 – 2.1, W: 1 – 2, D: 0.5 – 1.2


Shape: Usually broader at hilum end, bud seeds variable. Seeds in baggy seed coat that sometimes makes seeds appear winged around the edges.

Color: Inner seed dark brown to black, seedcoat white and transparent.

Surface: Seed coat finely longitudinally striate and glossy.

Could be confused with: Delphinium menziesii.

Latitudinal Cross Section: obovate DENU lat.png

Longitudinal Cross Section: semi circular

Photo Gallery