Metastelma arizonicum A. Gray
Family: Apocynaceae
Arizona swallow-wort,  more...
[Cynanchum arizonicum (A. Gray) Shinners]
Metastelma arizonicum image
Margarethe Brummermann  
Plant: vine; stems pubescent in lines above the petioles Leaves: oblong (the revolute margins often giving a linear appearance, especially in dried material), 0.6-3 cm long, 0.3-0.5 cm broad, glabrous, sparsely pubescent to glabrate on the midvein above and beneath, the margins sparsely ciliate; petioles pubescent above, 2-3 mm long INFLORESCENCE: subsessile, umbelliform, ca. 1 cm across Flowers: 3-4 mm long; calyx lobes ca. 2 mm long; corolla whitish to yellowish, campanulate, the tube ca. 1 mm long, the lobes narrowly ovate, 2-4 mm long, densely pilose inside, the tips recurved; crown segments distinct, 1-2 mm long, erect, linear-lanceolate, slightly surpassing the stigma-head; anther wings ca. 0.4 mm long; corpusculum 0.2 mm long, the pollinia oblanceolate, ca. 0.25 mm long; stigma head apically rounded Fruit: FOLLICLES 3-6(-7) cm long Misc: Rocky slopes and canyons of desert mt. ranges; 450-1350 m (1500-4500 ft); all year (mostly May-Oct) REFERENCES: Sundell, Eric. 1994. Asclepiadaceae. J. Ariz. - Nev. Acad. Sci. Volume 27, 169-187.
Sundell 1993, Wiggins 1964, Kearny and Peebles 1979
Duration: Perennial Nativity: Native Lifeform: Vine General: Slender branched vine, woody at base; the stem pubescent in lines above the petioles, 0.5-2.5 m. Leaves: Opposite and short-petioled, the petioles 1-3 mm long, pubescent above; blades oblong with strongly revolute margins, appearing linear, 0.5-3 cm long about 5 mm broad, shining and dark green above, sparsely pubescent on midvein above and beneath, the margins sparsely ciliate. Flowers: White, in axillary umbels; flowers 3-4 mm long; calyx lobes about 2 mm long; corolla whitish to yellowish, with 5 petals, campanulate, densely villous within; crown segments distinct, 1-2 mm long, linear-lanceolate, slight longer than stigma-head. Fruits: Fusiform follicle 3-7 cm long, glabrous, 4-5 mm wide. Ecology: Found on rocky slopes and in canyons from 1,500-4,500 ft (457-1372 m), flowers May-October. Distribution: From c AZ south into Sonora, MEX. Notes: Look for a vine with opposite leaves which are distinctive with their tightly revolute margins that make the oblong leaves look nearly linear; small white flowers with hairy petals; and milky sap. Other common milkweed vines, (Funastrum cyanchoides (Syn: Sarcostemma cyanchoides) and F. crispum) have larger, showier flowers that are not distinctively hairy. Ethnobotany: Unknown Etymology: Metastelma comes from the Greek meta or instead and stelma a crown, referring to the absence of a corona, while arizonica means of or from Arizona. Synonyms: Cynanchum arizonicum, Metastelma albiflorum, Metastelma watsonianum Editor: SBuckley 2011, AHazelton 2015
Metastelma arizonicum image
Liz Makings  
Metastelma arizonicum image
Liz Makings  
Metastelma arizonicum image
Sue Carnahan  
Metastelma arizonicum image
Sue Carnahan  
Metastelma arizonicum image
Sue Carnahan  
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Steve Jones  
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image
Metastelma arizonicum image