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BOTANY. 



163 



2|-4 inches long^ and l|-2^ inches wide, when old nearly glahrous and somewhat coriaceous ' 

 petioles 2-3 lines long. Peduncles scarcely an inch long. Umbels several, in the axils of the 

 upper leaves, 15-25-fiow^ered, Corolla greenish w^iite ; hoods dull pale purple. Follicles 4 

 inches long, and an inch in diameter in the middle, attenuated to a long point. Allied to 

 A, Jamesii. 



'|{J AscLEPiAs ivUMMULARiA (u. sp.) I caule humiK ; foliis oppositis orbiculatis albo-lanatis ; 



pedunculis folio longioribus ; cucullis ovatis gynostegio sessili subduplo longioribus, processu 

 falcate vix exserto. (Table XLV, A.) Copper Mines, New Mexico, April; Bigelow^ Thurler. 

 {Santa Maria, Chihuahua ; Parrij. Santa Cruz, Sonera ; Capt. E. K. Smith. — Stems several 

 from a thick ligneous root-stock, 1-2 iuches long. Leaves in 2 or 3 closely approximated pairs 

 1-K^ 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 2| inches long ; umbel 

 15-20-flowerGd, the pedicels about three-fourths of an inch long. Corolla greenish white; the 

 sef^ments oblonsr and reflexed. Hoods obliouelv truncate inward, entire, somewhat snreadinrr 



^. *.K. ^^^XV^X^Q 



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 

 habit of Steinheilia radians, as represented in Deless. Ic. 5, t. 61. 



AscLEPiAS INVOLL'CRATA {Eugelm, MSS.): caulibus e basi lignoso brevi pluribus ; foliis oppositis 

 alternisve lineari-lanceolatis brevi-petiolatis margine tomentosis; umbellis terrainalibus sessilibus 

 foliis 2-4 involucratis ; cucullis ovatis acutiusculis patentibus gynostegio subduplo longioribus ' 

 processu cultriformi vix exserto; folliculis ovato-oblongis la3vibus. — Sandy soils, on the Mimbres 

 and near the Coppei' Mines ; also sandy pLains between Laguna de Guzman and the Rio Grande ' 

 April — May ; Bigelow^ Thurher. San Luis mountain, Sonora ; Capt. E. K. Smith. (No. 1690 

 JVrighf. No. 107, Eendler.) Stems 3-6 inches long, erect or spreading, somewhat pubescent. 

 Leaves 1^-2| 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. Pedicels 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 2| inches long, and f inch in diameter, acute, but scarcely 

 attenuated at the summit. 



AscLEPiAS BUAQRYSTEPB Ai!^ A (En g elm. 3ISS,): caule ramoso ; foliis oppositis lineari-lanceolatis 

 ionge angustatis basi in petiolum bievem attenuatis glabratis ; umbellis pluribus extra- 



axillaribus pedunculatis plurifloris ; cucullis truncatis antice bidentatis gynostegio sessili 

 dimidio brevioribus, processu falcifbrmi vertical! ; folliculis oblongis Itevibus. — Sandy soils, 

 Valley of the upper Eio Grande, Chihuahua, and Sonora; April — July. (No. 1692, Wright.) 

 Dr Gregg found it in dry valleys west of Saltillo. Stem 8-12 inches long, branching from the 

 base upward. Leaves 3-6 inches long, gradually taj)ering from a rather broad base to a lono^ 

 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, Linu. Sp. p. 314/ Eecai&7ie, L 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; Schottj Wright. 





