BOTANY OF THE ROUTE. 
51 
PLANTS COLLECTED FROM THE SUMMIT OF THE CASCADE MOUNTAINS, 
EASTWARD TO THE UPPER COLUMBIA RIVER, AND NORTHWARD TO THE 
FORTY-NINTH DEGREE OF LATITUDE, BETWEEN JULY AND SEPTEMBER, 
1853. 
Ranunculus alismaefolius, Geyer, var? In a marsh, not far southeast of Mount Adams; 
August 12; rare. 
Delphinum simplex, Dough Common in prairies; from Vancouver eastward; August 12. 
Aconitum Columbianum, Nutt. (A. Nasutum, Fischer.) Two varieties found on borders of 
mountain streams on eastern slope of Cascade range; August 13; rare, 4 feet high, flowers deep 
blue. 
Nasturtium lyratum, Nutt. Along hanks of Columbia river, near the Dalles; November; 
common. 
Cleome lutea, Hooker. South hank of Columbia, from Walla-Walla to the Dalles; not seen 
northward; November 8 to 15. 
Spraguea umbellata, Torr. High on Cascade mountains, east of Mount Adams; August. A 
single depauperate specimen. “It was known only from the base of the Sierra Nevada in 
Upper California, where Fremont gathered the specimens described and figured by Dr. Torrey 
in his Plant® Fremontian®.”— Gray. 
Sidalcea malvaeflora, Gray. Small form. ($. Oregona,) Nutt, in FI. of N. A.) Common 
along both sides from the height of 4,000 feet downwards; August 12; 2 feet, purple. 
Malvastrum Munroanum, Gray. Near mouth of Okanagan river; October 4. Second 
flowering on land lately burnt over; orange red. U M. Thurberi , Gray, (Plant® Thurberian®,) 
is the same as this, or at least is the M. fasciculata , Nutt., which has been referred to M. 
Munroana. } ’ —Gray. 
Erodium cicutarium, L’ Her. Common along streams on the higher parts of the range east 
of the summit; August. 
Geranium incisum, Nutt. Not very common at the same time and place. Two feet high, 
flowers pale purple. 
Acer glabrum, Torr. (A. Douglassii, Hook.) Not abundant. On the mountains east of the 
summit only; fruit nearly ripe in August; a small tree. 
Vicia Americana, Muhl. (V. Oregana, Nutt.) Common in damp places. 
Lathyrus palustris, Linn., var. Several varieties common with the preceding, but in 
damper soil. 
Hosackia Purshiana, Benth. and varieties. Common, but out of flower except in shady 
and damp spots. 
Astragalus (Homalobus) serotinus, n. sp., PI. V. Near the Columbia river, about latitude 
48°. Rare; probably a second growth on burnt ground; October. 
11 Description .—Cinereous, with a minute strigulose pubescence; stems branching from the 
perennial root, ascending, slender, angled, oftenflexuous, (8-15 inches high; stipules triangular- 
acuminate, more or less united opposite the petiole; leaflets 9-21, linear (rarely oblong-linear 
or oblanceolate) mucronate, not rigid, glabrous, or nearly so above, the terminal one resembling 
the others; peduncles exceeding the leaves; racemes loosely many-flowered, virgate; bracts 
much shorter than the at length spreading or recurved pedicels; calyx campanulate minutely 
