RANUNCULACEAE. 



Vol. II. 



I. Delphinium Ajacis L. Rocket Larkspur. 

 Fig. 1870. 



Delphinium Ajacis L. Sp. PI. 531. 1753. 



Annual, finely pubescent, somewhat branched, 3° 

 high or less, usually branched. Leaves finely dis- 

 sected into narrowly linear, acutish segments, mostly 

 less than i" wide, or those of the lower leaves 

 somewhat wider; lower leaves petioled, the upper 

 sessile or nearly so; flowers racemose; racemes 

 short or elongated, sometimes 10' long, the pedicels 

 i'-i' long; flowers blue, rarely white; spur slender, 

 somewhat curved, about i' long; pistil i; style pu- 

 bescent; follicle erect, pubescent, beaked. 



Fields, meadows and waste grounds. Nova Scotia to 

 South Carolina, Montana and Kansas. June-Aug. 



2. Delphinium exaltatum Ait. Tall 

 Larkspur. Fig. 1871. 



Delphinium exaltatum Ait. Hort. Kew. 2 : 244. 

 1789. 



Slender, 2°-6° high, glabrous or spar- 

 ingly hairy below, densely pubescent above. 

 Leaves large, all but the upper petioled, 

 deeply 3-5-cleft, the divisions lanceolate or 

 oblanceolate, cuneate, acuminate, cleft and 

 toothed toward the apex, upper ones re- 

 duced to small linear or lanceolate bracts 

 subtending the flowers ; racemes dense, 

 elongated (sometimes over 1° in length) ; 

 flowers purple or blue, 8"-io" long, downy- 

 pubescent, the lower pedicels about i" long; 

 spur nearly straight, 4" long; follicles 3, 

 erect, 4"-5" long, pubescent, tipped with a 

 subulate beak. 



In woods, Allegheny and Huntingdon Cos., 

 Pa., to Minnesota, south to North Carolina, 

 Alabama and Nebraska. Has been mistaken 

 for D. urceolatum Jacq. July-Aug. 



3. Delphinium Treleasei Bush. Trelease's 

 Larkspur. Fig. 1872. 



Delphinium Treleasei Bush ; Davis, Minn. Bot. Stud. 

 2 : 444. 1900. 



Perennial, with fascicled roots, glabrous, 

 slightly glaucous, 2°-4° high, the stem-leaves 

 few. Basal leaves long-petioled, deeply pal- 

 matifid into linear segments 2" wide or less; 

 raceme loose, pyramidal in outline, often a foot 

 long, the pedicels very slender, ascending, the 

 lower 2'-4' long, sometimes branched, the upper 

 shorter : flowers blue or blue-purple ; sepals and 

 spur about equal in length, puberulent ; spur 

 straight, f long; sepals narrowly ovate; bractlets 

 borne somewhat below the calyx ; petals yellow- 

 bearded ; follicles 3, erect, slightly puberulent. 



In barrens, Missouri. May-June. 



