BOTANY. 163 
23-4 inches long, and 14-23 inches wide, when old nearly glabrous and somewhat coriaceous ; 
petioles 2-3 lines long. Peduncles scarcely an inch long. Umbels several, in the axils of the 
upper leaves, 15-25-flowered. Corolla greenish white; hoods dull pale purple. Follicles 4 
inches long, and an inch in diameter in the middle, attenuated to a long point. Allied to 
А. Jamesii. : 
ASCLEPIAS NUMMULARIA (n. sp.): caule humili; foliis oppositis orbiculatis albo-lanatis ; 
pedunculis folio longioribus; cucullis ovatis gynostegio sessili subduplo longioribus, processu 
faleato vix exserto. (TABLE XLV, A.) Copper Mines, New Mexico, April; Bigelow, Thurber. 
Banta Maria, Chihuahua; Parry. Santa Cruz, Sonora; Capt. E. К. Smith.—Stems several 
from a thick ligneous root-stock, 1-2 inches long. Leaves in 2 or З closely approximated pairs, 
1—14 inches in length and breadth, with a very short abrupt acumination, often slightly cordate 
at the base, clothed with a softly white pubescence. Peduncles 2 or 21 inches long; umbel 
15-20-flowered, the pedicels about three-fourths of an inch long. Corolla greenish white; the 
segments oblong and reflexed. Hoods obliquely truncate inward, entire, somewhat spreading. 
Projecting margins of the anthers rounded.  Pollen-masses triangular. Immature pods ovate, 
tomentose.—A remarkable species ; very distinct from any other of the genus. It has much the 
Mx NE of Steinheilia radians, as represented in Deless. Jc. 5, t. 61. 
ASCLEPIAS INVOLUCRATA (Engelm. MSS.): caulibus e basi lignoso brevi pluribus ; foliis oppositis 
alternisve lineari-lanceolatis brevi-petiolatis margine tomentosis ; umbellis terminalibus sessilibus 
foliis 2-4 involucratis ; cucullis ovatis acutiusculis patentibus gynostegio subduplo longioribus ; 
processu cultriformi vix exserto; folliculis ovato-oblongis levibus.—Sandy soils, on the Mimbres 
and near the Copper Mines ; also sandy plains between Laguna de Guzman and the Rio Grande ; 
April—May ; Bigelow, Thurber. San Luis mountain, Sonora; Capt. E. К. Smith. (No. 1690, 一 
Wright. No. 101, Fendler.) Stems 3-6 inches long, erect or spreading, somewhat pubescent. 
Leaves 14-23 inches long, opposite and alternate, mucronate, nearly smooth above, except on 
the margin, a little pubescent on the veins underneath. Umbel 10-15-flowered, involucrate, 
with 1-2 pairs of leaves similar to those of the stem. Редісеів about three-fourths of an inch 
long. Corolla greenish white, the segments ovate and reflexed. Hoods spreading, and their 
points often a little recurved. Margin of the anthers projecting and acutely angular at the 
base. Pollen-masses pyriform. Pod 21 inches long, and š inch in diameter, acute, but scarcely 
attenuated at the summit. 
ASCLEPIAS BRACHYSTEPHANA (Engelm. MSS.): caule ramoso ; foliis oppositis lineari-lanceolatis ~.. 
longe angustatis basi in petiolum brevem attenuatis glabratis ; umbellis pluribus extra- 
axillaribus pedunculatis plurifloris; cucullis truncatis antice bidentatis gynostegio sessili 
dimidio brevioribus, processu falciformi verticali; folliculis oblongis levibus.—Sandy soils, 
Valley of the upper Rio Grande, Chihuahua, and Sonora; April—July. (Хо. 1692, Wright.) 
Dr Gregg found it in dry valleys west of Saltillo. Stem 8-12 inches Бай улаа fron the 
base upward. Leaves 3-6 inches long, gradually tapering from a rather broad base to a long 
narrow point ; petiole 2-3 lines long. Umbels 3-8 on each branch, the peduncles much shorter 
than the pedicels. Corolla dull purple, the segments ovate-oblong, reflexed. Cuculli broader 
than long, the inner margin produced into a tooth above. Margins of the anthers angular at 
the base. Pollen-masses pyriform. ° Pods 2 inches long, acuminate. 
ASCLEPIAS INCARNATA, Linn. Sp. p. 314; Decaisne, 1. c. p. 567. Copper Mines, New Mexico, 
July; Bigelow. Var. foliis lato-linearibus vix puberulis. Banks of Devil's river, western 
- Texas, September; Bigelow. Lower Rio Grande; Schott, Wright. 
