EANUNCULACEAB (BUTTERCUP FAMILY) 193 



t 

 least above; stem slender, simple^ 1-3 dm. high, from a cltister of ti^bpi-ous, 

 easily detachable roots: leaves firm, divided into linear segments: flbwers 

 blue, slightly villous, slender-pediceled: sepals oblong, shorter than the 

 slender spur: lower petal 2-cleft, pubescent and with a tuft of hairs about the 

 middle: follicles pubescent or glabrate: seeds wing-angled above. (D. dume- 

 iorum Greene, PL Baker. 3: 4. 1901.) — Western Nebraska through Wyoming 

 and Colorado to Utah. 



3. Delphinium bicolor Nutt. Joiim. Acad. Phila. 7: 10. 1834. Glabrous 

 or pubescent, 2-3 dm. high, rather stout, from thickish fascicled deep-set 

 roots: leaves deeply parted, the segments cleft or'.'pstrted into linep,r lobes: 

 raceme open, few-flowered, the lower pedicels elongated: flowers abdut'.2 cm. 

 long: upper petals yellowish and copiously blue- veined: mature follicles 

 glabrous, erect or recurving. — Northern Wyoming, west to Oregon. 



4. Delphinium scaposuin Greene, Bot. Gaz. 6: 1,56. 1880. Glabrous; stems 

 scapose, 2-4 dm. high, from thickish branching roots: leaves clustered at the 

 base, short-petioled, round or reniform in outline, and mostly oblon'^'or sub- 

 cnneate divisions and lobes: raceme seiVetal-flowered; the flowers bjue: sepals 

 oblong, 10-14 min.long, shorter than the somewhat curved spiir: folhcles 

 oval, erect: seeds with rugose and ariliform coat.— ^Western Colorado to Ne- 

 vada. ' 



5. DelphiniumGeyesiGreene, Erythea2: 189. 1894. Canescently tomentu- 

 lose throughout; stems usually several or many from a bundle of woody 4eep- 

 set roots, 2-5 dm. high: basal leaves numerous and tufted, petioled; the cau- " 

 line diminishing upward; all rather thick, cut into many linear segments, 

 these tipped with a white callosity: raceme long, with many azure-blue 

 flowers: spur horizontal or ascending, stoutish. This is the species that is 

 commonly known as Poisqn Weed. The tuft of radical leaves develops early 

 and, these if eaten freely produce fatal bloating in ca,ttle unless th^ animal 

 is relieved promptly by the use of a trochar. — Very abundant on the plains 

 in our range. 



6. Delphinium carolinianum Walt. Fl. Car. 155, 1788. Puberident or 

 pubescent; stem solitary, strict, simple or nearly 'so, 2-5 dm. high: leaVes 

 3-5-parted or cleft, usually into linear lobes: raceme spiciform, inany-flowered: 

 flowers varying from blue to white or even greenish-white: sepals sometimes 

 tipped with brown: spur horizontal or ascendiligj petals 'rather heavily pilose: 

 follicles oblong, erect. D. azureum. (D. ajh'escens Rydb. in Brit. Man. 

 417. 1901.)^From the e3,stern base of the Rocky Mountains far to the 

 eastward. ' ~ . ' . ' 



6a. Delphinium carolinianum. Penhardii (Huth.) A. I^els. A form with 

 flowers mostly white and the spurs curved apd erect. (Z). Penfe^T'diCHuth. 

 Helios 10: 2jl 1893; D. camporum Greene, Erythea 2: 183. 1894.)— On the 

 great plains, eastward of the Rocky Mountains. , 



7. Delphinium sapellonis Ckll. Bot. Gaz. 34: 453. 1902; Very glandular 

 or 'viscid-pubescent, especially above; stem strict 8-18 dm. high: leaves 

 tripartite; the lateral divisions large and themselves almost tripartite; the 

 segments mostly linear: racemes long, narrow, ma,ny-flowered; flowers rather 

 small, dull-colored, greenish-brown and more or less streaked with dull purple: 

 spur ascending; petals somewhat pilose with yellpw hairs. — ^New Mexico, and 

 may reach Colorado. , 



,8. Delphinium, scopulorum Gray, PL Wright, 2: 9. 1853. Glabrous below, 

 minutely pubescent in the inflorescence; stem usually rimple, 3r-8 dm. high: 

 leaves lacmiately multifid; the primary and secondary divisions cuneiform in 

 outline, laciniately manyrcleft into lance-linear very acute segments: flowers 

 rather large, indigo-blue, in a strict raceme: spur longer than the .sepals: 

 follicles erect, nearly glabrous. — New Mexico and probably in s(Jiithern 

 Colorado, . . 



9. Delphinium robustum Rydb. Bull. Torr. Bot. Club 28: 276. 1901., 

 Puberulent throughout; stem stout, often 2 m. or more high: leaves .divided 

 into 5-7 segments which are 6-12 cm. long and twice cleft into linear lobes: 

 inflorescence branched, many-flowered: sepals elliptical, dark blue, as long as 



