COULTER AND ROSE—NORTH AMERICAN UMBELLIFERAE, 445 
Ptilimnium texense C. «& R. sp. nov. 
Stems slender, erect, 70 to 90 em. high, somewhat branching near the top; leaves 
short-petioled, finely dissected, the segments numerous and filiform; peduncles slen- 
der, 10 em. long or less; involucral bracts numerous, 3-parted, the lobes linear; 
involucel bractlets linear, entire; rays about 20, nearly equal, 4 em. long; pedicels 
6 to 8 mm. long; flowers autumnal, white; calyx teeth large; fruit oblong, 2 mm. 
long; dorsal and intermediate ribs filiform; stylopodia prominent, crowned by the 
short styles. 
Collected by F. W. Thurow, near Hockley, Texas, September, 1890. 
Type U.S. National Museum no. 41256. 
A reexamination of this material has convinced us that this is a good species, com- 
bining, as stated in the Monograph, the cleft involucral bracts, characteristic fruit 
ribs, and shorter styles of P. capillacewm with the stouter habit, smaller fruit, and 
larger calyx teeth of P. nuttalli’. 
LIGUSTICUM L. Sp. Pl. 250. 1753. 
The following species has been segregated from £4. sémulans 
C. & R34 
Ligusticum affine A. Nelson, Bull. Torr, Club 28: 225. 1901. 
LIGUSTICELLA ©. & R. gen. nov. 
Calyx teeth evident; fruit ovate, flattened laterally, glabrous; carpel with filiform 
ribs, the laterals no more prominent than the dorsals; stylopodium conical; oil tubes 
2 or 3in the intervals, 4 on the commissural side; seed considerably broader than 
thick, with nearly plane face. 
Low, glabrous, acaulescent perennials, with small, simply pinnate leaves, no 
involucre (rarely 1 or 2 caducous bracts), involucels of broad, toothed bractlets, and 
yellowish green flowers in few-rayed, compact umbels. 
The genus is founded on Ligusticum eastwoodae C. & R., and differs from Ligusticum 
in its acaulescent habit, simply pinnate leavex, smatl and compact few-rayed umbels, 
yellowish flowers, and equal filiform ribs of the fruit. It resembles Orumbella in 
habit and foliage; but that genus has a conspicuous involucre, prominently ribbed 
fruit, and purple flowers. Furthermore, Orumbella is an Alaskan coast plant, while 
Ligusticella is a high alpine plant of Colorado. 
Ligusticella eastwoodae C. & R. PLate LXNXNIT. 
Ligusticum eastwoodae C. & R. Contr. Nat. Herb, 3: 320. pl. 13. 1895. 
High mountains of Colorado. 
EXPLANATION OF PLATE LXXXII.—Plant; a, fruiting umbel; }, dorsal view of carpel: ¢, cross 
section of carpel. Plant naturai size: @, natural size; b, scale 5: ¢, scale 11. 
ORUMBELLA C. « R. gen. nov. 
Calyx teeth small, but evident; fruit shortly oblong, flattened laterally, glabrous; 
earpel with prominent ribs, the lateral ones slightly broader; stylopodium conical; 
oil tubes 2 or 3 in the intervals, 2 to 4 on the commissural side; seed with round back 
and plane face. 
Low, glabrous, acaulescent perennials, with small, simply pinnate leaves, con- 
spicuous involucre, involucels of narrow bractlets, and purple flowers in few-rayed 
umbels. 
The genus is founded on Ligusticum macounii C. & R., and differs from Lizusticum 
in.its acaulescent habit, simply pinnate leaves, conspicuous involucre, small few- 
rayed umbels, and minor differences in the fruit. 
The name Orumbella refers to the coastal habitat of the plant. 
aContr. U. S. Nat. Herb. 7: 135. 1900. 
