The Collaborative International Dictionary of English v.0.48:

Larkspur \Lark"spur\, n. (Bot.)
   A genus of ranunculaceous plants (Delphinium), having showy
   flowers, and a spurred calyx. They are natives of the North
   Temperate zone. The commonest larkspur of the gardens is
   Delphinium Consolida. The flower of the bee larkspur
   (Delphinium elatum) has two petals bearded with yellow
   hairs, and looks not unlike a bee.
   [1913 Webster]

WordNet (r) 3.0 (2006):

larkspur
    n 1: any of numerous cultivated plants of the genus Delphinium

U.S. Gazetteer Places (2000):

Larkspur, CA -- U.S. city in California
   Population (2000):    12014
   Housing Units (2000): 6413
   Land area (2000):     3.133820 sq. miles (8.116555 sq. km)
   Water area (2000):    0.134776 sq. miles (0.349069 sq. km)
   Total area (2000):    3.268596 sq. miles (8.465624 sq. km)
   FIPS code:            40438
   Located within:       California (CA), FIPS 06
   Location:             37.941074 N, 122.530241 W
   ZIP Codes (1990):     94939
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Larkspur, CA
    Larkspur


U.S. Gazetteer Places (2000):

Larkspur, CO -- U.S. town in Colorado
   Population (2000):    234
   Housing Units (2000): 94
   Land area (2000):     1.348624 sq. miles (3.492920 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.348624 sq. miles (3.492920 sq. km)
   FIPS code:            43550
   Located within:       Colorado (CO), FIPS 08
   Location:             39.227091 N, 104.884233 W
   ZIP Codes (1990):     80118
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Larkspur, CO
    Larkspur