Delphinium robustum Rydb.

  • Authority

    New York Botanical Garden. Herbarium of Dr. Per Axel Rydberg. Purchased, 1899. Contributions from the New York Botanical Garden.

  • Family


  • Scientific Name

    Delphinium robustum Rydb.

  • Description

    Species Description - A tall and stout perennial, often 2 m. high or more. Stem leafy, striate, puberulent throughout, often 1 cm. in diameter at the base; petioles 1-2 dm. long, puberulent; leaf-blade finely and sparingly puberulent on both sides, divided to the base into 5-7 segments, which are 6—12 cm. long and twice cleft into linear lobes 3-5 mm. broad: inflorescence branched, densely many-flowered: pedicels 1-3 cm. long, rather stout, usually equalled or surpassed by the linear bracts: bractlets filiform, 5-10 mm. long, inserted close under the calyx: sepals dark blue, paler at the base, elliptical, all except the upper one obtuse, 12-15 mm long; spur 12 mm. long, slightly curved: upper petals narrow, light brownish, striate: lateral petals with slender claws bent at right angles, bearded only within, deeply 2 -cleft at the apex.

  • Discussion

    This species in perhaps closest related to D. cncidlatiivi A. Nelson but differs in the longer and narrower leaf-segments, the more branched inflorescence, the stouter habit, the longer bracts and bractlets and narrower upper petals. It grows at an altitude of about 2500 m.

    Colorado : Wahatoya Creek, below the Spanish Peaks, 1900, Rydberg & Vreeland, 6217 (type); Colorado Springs, 1895, E. A. Bessey ; Ruton, 1840, Albert.

  • Distribution


    Colorado United States of America North America|