3386 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
NEW SPECIES OF SEVERAL GENERA. 
Ammoselinum popei (T. & G.) Gray, has not been collected in Mexico for many 
years. It has recently been found again by Mr. C. G. Pringle (no. 8315) near 
Diaz, on the northern border, 
Arracacia humilis Rose, sp. nov. 
Stems herbaceous, the lower portion spreading and more or less imbedded 
humus and undergrowth, glabrous throughout; leaves twice ternate; leaflets ovate, 
more or less lacerate and sharply, almost spinulosely-toothed, pale and somewhat 
glaucescent, 1 to 2.5m. long; peduncles slender, overtopping the leaves, 10 to 20 em. 
long; rays 8 to 10, fruiting ones few, nearly erect, slender, about 5 em. long; invo- 
lucre wanting; involucel bractlets several, longer than the pedicels, narrow, 3-cleft 
near the apex; pedicels stout, 3 to 4 mm. long; fruit ovate, 4 mm. long, rounded at 
the base; stylopodium low. 
Collected by C. and E, Seler in mountain woods between Totonocapan and Los 
Encuentros, Guatemala, September 25, 1896 (no. 2342). 
Near A, brevipes, but with foliage, involucel bracts, etc., glabrous. 
Coulterophytum holwayi Rose, sp. nov. 
Perennial with tall stems woody at base; leaves large, the main branches 30 to 40 
em. long, ternate, then twice pinnate; leaflets ovate, long-acuminate, petioled or 
sessile, 5 to 12 em, long, 2.5 to 5 em. broad at widest point, cuneate, rounded or even 
broadly cordate at base, dark green above and glabrate, densely cinereous-puberu- 
lent beneath, sharply serrate; stipular sheath large, inflated; inflorescence of numer- 
ous slender short (4 to 8 cm. long) peduncles, variously angled; involucel bracts 
linear, shorter than the pedicels (4 to 5 mm. long); ovary puberulent; fruit seen 
immature. 
Collected by E. W. D. Holway near Zapotlan, Jalisco, October 9, 1903 (no. 5138). 
Hydrocotyle yucatanensis Millsp. Bot. Field Col. Mus. 2: 81. 1900, seems not to 
differ from true /7/, bonariensis. 
Ligusticum madrense Rose, sp. nov. 
Stems 60 to 90 em. high, glabrous; basal leaves rather small, somewhat narrow in 
outline, once or twice ternate, then once to twice pinnate; leaflets ovate, sometimes 
merely toothed, at other times cut into linear lobes, somewhat scabrous on the 
margins; umbels terminal and axillary, apparently never verticillate, 1 to 2 dm. 
long, somewhat scabrous at the top (as are the rays and pedicels throughout); rays 
numerous, about equal, 3 to 7 em. long; pedicels slender, 8 to 15 mm. long; invo- 
lucre wanting; involucel consisting of several filiform elongated bractlets; fruit seen 
immature, glabrous. 
Collected by C. H. Tyler Townsend and C. M. Barber, in the Sierra Madre, 5 
miles southeast of Colonia Garcia, Chihuahua, September 28, 1899 (no, 350). 
This species is quite different from the two other North Mexican species (/.. gold- 
mani and I. nelsoni) in its foliage and involucel bractlets. 
Museniopsis arguta Rose, sp. nov. 
Perennials from elongated thickened roots, 40 to 50 em. high, slender, glabrous, 
somewhat glaucous, purplish below, somewhat branching above; leaves mostly basal, 
bipinnate or ternate-pinnate, the lower pair of segments elongated; leaflets on seg- 
ments ovate, the terminal ones more elongated, acute, | to 3. em. long, sharply serrate, 
the larger ones first cut or cleft and then serrate, slightly scabrous on the veins; petioles 
about the length of the blade; upper leaves somewhat similar but reduced, the 
uppermost bract-like, linear or of linear lobes; peduncles slender 6 to 10 em. long; 
rays 5 to 10, nearly equal, 15 to 25 mm. long; involucel bractlets 3 or 4, filiform, 
longer than the pedicels (2 mm. long); fruit ovate, cordate at base, 3.5 mm. long, 
glabrous, flattened laterally; carpels with 5 filiform ribs, rather conspicuous; oil tubes 
