6386 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
6. GAERTNERIA Medic. 
Herbaceous annuals or perennials with mostly alternate, variously parted leaves; 
heads of staminate flowers as in Ambrosia or sometimes mixed with the pistillate; 
fertile involucre 1 to 4-flowered, 1 to 4-celled, with 1 to 4 beaks, armed with numerous 
sharp spines in several series. 
KEY TO THE SPECIES. 
Leaves simply pinnate or simple. ..... 2.2.2.0... eee cece eens 1. G. grayi. 
Leaves twice or thrice pinnately dissected. 
Leaves interruptedly pinnate, with ovate or triangular 
divisions, tomentose beneath.......................... 2. G. tomentosa. 
Leaves regularly pinnate with linear to oblong divisions, 
not tomentose beneath. 
Annual; staminate involucres cleft below the middle.. 3. G@. acanthicarpa. 
Perennial; staminate involucres not cleft to the middle.. 4. G. tenuifolia. 
1. Gaertneria grayi A. Nels. Bot. Gaz. 34: 35. 1902. 
Franseria tomentosa A. Gray, Mem, Amer. Acad. n. ser. 4: 80. 1849, not, Ambrosia 
tomentosa Nutt. 1818. 
Type Locauiry: ‘‘High banks of Walnut Creek, between Council Grove and Fort 
Mann, of the Arkansas.”’ 
Rance: Kansas and Colorado to New Mexico and Texas. 
We have seen no specimens of this from New Mexico, but it was collected by 
Griffiths at Texline, Texas, so no doubt occurs in eastern and northeastern New 
Mexico. Valleys, in the Upper Sonoran Zone. 
2. Gaertneria tomentosa (Nutt.) A. Nels. Bot. Gaz. 34: 34. 1902. 
Ambrosia tomentosa Nutt. Gen. Pl. 2: 186. 1818. 
Franseria discolor Nutt. Trans. Amer. Phil. Soc. n. ser. '7: 507. 1841. 
Franseria tomentosa A. Nels. in Coulter, New Man. Rocky Mount. 542. 1909. 
Type Locatity: ‘“‘In Upper Louisiana on the banks of the Missouri.” 
Rance: Montana to New Mexico. 
New Mexico: Winsors Ranch; Cleveland; Maxwell City; Mora. Waste and cul- 
tivated ground, in the Upper Sonoran and Transition zones. 
3. Gaertneria acanthicarpa (Hook.) Britton, Mem. Torrey Club 5: 332, 1894. 
Ambrosia acanthicarpa Took. Fl. Bor. Amer. 1: 309, 1830. 
Franseria hookeriana Nutt.; Torr. & Gray, Fl. N. Amer. 2: 294, 1842. 
Type Locauity: ‘‘Banks of the Saskatchewan and Red River.’’ 
RanaGe: British America to Texas and California. 
_ New Mexico: Common throughout the State. Plains and valleys, especially in 
cultivated and waste ground, in the Lower and Upper Sonoran zones. 
One of the commonest weeds in cultivated fields almost everywhere in the State. 
It is often called ‘‘ragweed,’’ but of course is very different from the true ragweed of 
the Eastern States. 
4. Gaertneria tenuifolia (A. Gray) Kuntze, Rev. Gen. Pl. 1: 339. 1891. 
Franseria tenuifolia A. Gray, Mem. Amer. Acad. n. ser. 4: 80. 1849. 
.TypE Locauity: “‘Pofii Creek, between Bent’s Fort and Santa Fe; also at Santa Fe,’’ 
New Mexico. Type collected by Fendler. 
Ranae: Kansas and Colorado to Texas and California, also in Mexico. 
New Mexico: Santa Fe; Raton Mountains; Clayton; Maxwell City; Albert; Kings- 
ton; Organ Mountains; Gray; Eagle Creek, Plains and moist fields, in the Upper 
Sonoran Zone. 
