114 



ASCLEriADACEAE 



Locs. — Lanfair, M. L. Tcnncnt ; Barnwell, T. # E. Brandegee. 



Kefs. — AsCLEPiAS NTCTAOINIFOLIA Gray, Proe. Am. Acad. 12:69 (1876), type loc. Eock Spr., 

 Providence Mts., Palmer; Jepson, Man. 774 (1925). Podostemma nyctaginifolia Greene, Pitt. 

 3:237 (1897). 



8. A. subulata Dec. Rush Milkweed. (Fig. 359.) Stems iu clusters, erect, 

 straight, rush-like, leafless or with a few filiform leaves, 3 to 8 feet high; herbage 



glabrous; umbels 6 to 14-flowerecl, 1 to l^/^ inches 

 wide; pedicels 6 to 8 lines long; flowers dull yel- 

 lowish-white; hoods elongated, twice the length 

 of the stamen-column, the 2 sides pressed to- 

 gether like a lupine keel and somewhat scimitar- 

 shaped in outline; horn a thin wing, borne above 

 the middle, its short sharp point scarcely ex- 

 serted from the folded hood; follicles slender, 

 long-acuminate, 2 to 51^4 inches long. 



Desert washes, 100 to 1500 feet : eastern Mo- 

 have Desert; Colorado Desert. East to southern 

 Nevada and south to Lower California. Apr.- 

 Sept. 



Locs. — Bagdad, T. Brandegee ; Eiverside Mts., Colo- 

 rado Eiver, Jepson 5236; Whitewater, ace. Peirson; 

 County Well, n. of Indio, Jepson 6030 ; Shaver Well, Jep- 

 son 12,547; betw. Kane Spr. and Oasis, C. V. Meyer 412; 

 Vallecito, e. San Diego Co., Jepson 8C33. Nev. : Search- 

 light, Parish 10,301. 



Eefs. — AscLEPiAs SUB0LATA Dec; DC, Prod. 8:571 

 (1844), type 



loe. ''Nov. His- _EV>0. f, 



pania, Pavon," (S^fBL t) 



that is, Me.xico, 

 but probably 

 Sesse cf- Mocino 

 (since "Pavon 

 himself was 

 never in Mex- 

 ico," cf . Hems- 

 ley in Godman 



& Salvin, Biol. Cent.-Am. 4:120) ; Torr., Pac. E. Eep. 



5:362, pi. 7 (1857) ; Jepson, Man. 774 (1925). 



Pig. 359. ASCLEPIAS SUBULATA 



Deo. a, flowering branchlet, X % ; b, 

 fl., XI; c, hood, X 2 ; d, long. sect, 

 of hood showing the short horn, X 2 ; 

 e, follicle, X ^,3. 



9. A. californica Greene. Round-hood 

 Milkweed. (Fig. 360.) Vegetative aspect of 

 A. vestita; stems 12 to 22 inches high; herbage 

 white-tomentose, somewhat cobwebby, the to- 

 mentum on the stems persistent, on the leaves 

 largely deciduous; leaves in whorls of 2, the 

 blades oval to ovate or oblong-lanceolate, 

 sharply acuminate, 1% to 3 inches, the lower 

 to 6 inches long; petioles 1 to 6 lines long; um- 

 bels nearly sessile, about 6 to 9-flowered ; corolla 

 purplish; hoods dark maroon, semiorbicular. 

 laterally compressed, centrally attached and 

 reaching nearly to the middle of the anthers, 

 2-clef t half-way down the back and destitute of 

 horn, shorter than the stamen-column ; follicles ovate, very acute, 1% to 2 inches long. 



Dry, grassy or sparsely wooded slopes, 1200 to 6000 feet : South Coast Ranges; 

 Sierra Nevada in Tulare and Kern Cos. ; south to San Diego Co. Lower California. 

 May-June. 



Pig. 360. ASCLEPIAS CALIFORNICA 



Greene, a, fl. branch, X V; ; &, fl., X 1 ; 

 c, hood, X Syo; d, follicle, X Va. 



