348 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
This somewhat resembles A. pseudaggregata, but is a larger plant, with 
pubescent stems and more densely pubescent inflorescence, the pubescence being 
also of a different character; the leaves, too, are prominently petioled, while 
those of A. pseudaggregata are mostly sessile, and the inflorescence is paniculate 
‘uther than dichotomously branched as it is in the latter species. Type in the 
herbarium of the University of California, collected at Saltillo, Coahuila, 
Mexico, 1898, Palmer 158. 
22. Allionia greggii Standley, sp. nov. 
Stems erect, rather slender, more or less subhirsute below, densely glandular- 
pubescent above, the branching dichotomous; leaf blades lanceolate or lance- 
ovate, mostly blunt-pointed but some of them acutish, rounded or cuneate at the 
base, glabrous; petioles one-half as long as the blades, sparingly subhirsute, the 
uppermost leaves sessile: inflorescence congested, subcymose; involucres short- 
pediceled, the lobes ovate, acute, densely covered with matted hairs, 3-flowered ; 
fruit 4 mim. long, with 5 thick but low ribs, not tuberculate, sparingly puberulent. 
The smooth and puberulent fruit, obtuse and narrower leaves which are not 
cordate at the base, and $-flowered involuecres separate this from A, glebri- 
folia, From A. pscudaggregata it is readily distinguished by the blunt, petioled 
leaves and more pubescent stem. Type in the herbarium of the Missouri: Botan- 
ical Garden, collected at San Antonio, near Saltillo, Mexico, September 1, 1848, 
Gregg 394b, 348, 394. 
23. Allionia comata Small, I]. Southeast. U. S. 407, 1905. 
Orybaphus nyctagineus pilosus A, Gray, Bot. Mex. Bound. 174. 1859, not 
Allionia pilosa Nutt. 
Specimens examined: 
TeExXAS?: Wright 1718, type collection. 
New Mexico: Silver City, 1SS0, Greene, Rusby 858; Magdalena, 1Sd7, 
Herrick 657, 
ARIZONA: Prescott, 1894, Towmey; Santa Rita Mountains, TSSO. Marae, 
24, Allionia gigantea Stiundley, sp. nov. 
Stems erect, simple below or sparingly branched, very stout and tall, probably 
considerably over 1 meter in height, softly dappressed-puberulent throughout ; 
leaf blades thick, the lower ones large, 10.5 ecm. long and 8 cm. wide or less, 
broadly ovate, obtuse, truncate at the base, almost sessile; the upper leaves 
oblong, 8.5 cm. long and 4.5 em. broad or less, obtuse, broadly cuneate or 
rounded at the base, prominently veined, short-petioled, the uppermost ones 
sessile; inflorescence paniculate, its branches opposite: involueres on pedicels 
10 mm. long or Jess, 10 mm. wide, and about 7 mm, high, the lobes broadly ovate, 
obtuse, densely and finely puberulent; flowers about 10 mm. long, the stamens 
slightly exserted; fruit 5 mm. long, 5-ribbed, the ribs tuberculate, the spaces 
between them puberulent, acutish above, somewhat narrowed below. 
The large size, thick and peculiarly seen leaves, small involucres, and 
pubescent stem separate this plant from A. floribunda and A. nyctaginea, to 
which it is most closely related. Type wna duplicate in the herbarium of the 
Missouri Botanical Garden, collected in Texas, on sands at Buzzards Spring, 
August 1, 1902, Reverchon. It was also collected by the same collector on sinds 
at Handley, October 38, 1902. 
Tracy's 8342 from Weatherford, 1902, seems to be the same plant at a more 
mature stage; its involucres are larger, about 16 mm. wide and 10 min. high. 
The plant is rather smaller, but it has the peculiar leaves and pubescent stems 
of the type, 
