Gonolobus arizonicus (A. Gray) Woods.
Family: Apocynaceae
(english: Arizona milkvine)
[Lachnostoma arizonicum A. Gray,  more]
Gonolobus arizonicus image
Thomas Van Devender  
Plant: perennial vine, Densely pilose, non-glandular, twining vines Leaves: lanceolate to ovate, the bases deeply to shallowly cordate to subsagittate, 2-9 cm long; petioles 1-5 cm long, shorter than the blades INFLORESCENCE: irregularly umbelliform to racemose, the peduncle tardily elongating to 3-4 cm. Flowers: 8-10 mm long; calyx lobes 4-6 mm long, somewhat longer than the corolla tube; corolla yellowish to white, green-veined on the lobes within, campanulate, the tube ca. 4-5 mm long, the lobes oblong, spreading-erect, about as long as the tube, hirsute to pilose outside and pilose toward the base inside; crown included within the corolla tube from which it arises and to which it is fused for ca. 1 mm, fleshy and cup-shaped, ca. 1.5 mm long on the inner surface and about equalling the base of the anther head, the rim free of the corolla for ca. 0.5 mm, undulate, the inner surface with 5 vertical ridges terminating at the rim in 5 pairs of knoblike lobes opposite the anthers; gynostegium elevated, the column ca. 2 mm high, the anther head funnel-shaped, slightly exserted from the corolla tube, the anther wings ca. 1 mm long; corpusculum 0.25 mm long, the pollinia pendulous from the translator arms, obovate, ca. 0.8 mm long with the upper 0.3 mm sterile and transparent; stigma head apically flat, depressed in the center Fruit: FOLLICLES 8-11 cm long, glabrous, prominently 5-winged Misc: Canyons and stream beds, desert mt. ranges; 900-1350 m (3000-4500 ft); Jul-Nov REFERENCES: Sundell, Eric. 1994. Asclepiadaceae. J. Ariz. - Nev. Acad. Sci. Volume 27, 169-187.
Sundell 1993, Wiggins 1964
Duration: Perennial Nativity: Native Lifeform: Vine General: Slender and twining vines, densely pilose with white hispid and spreading hairs, climbing to 2 m or more. Leaves: Opposite with internodes 3-20 cm long bearing slender petioles 1-5 cm long topped by lanceolate to ovate blades with deeply cordate bases, the blades 3-9 cm long, acute at the apex. Flowers: Axillary inflorescence racemose with 3-4 cm peduncle, 1-7 flowers, the pedicel equaling peduncles, the sepals ovate-lanceolate, 4-6 mm long, slightly longer than corolla tube, the corolla yellowish to white, campanulate, the tube 4-5 mm long with oblong lobes, about as wide in full flower, puberulent within and without, the crown fleshy, cup shaped and fused, the gynostegium is elevated with a column about 2 mm high, the anthers slightly exserted from the corolla tube, the stigma head flat on top, but slightly depressed in the middle. Fruits: Follicles 5-11 cm long, glabrous with wings 2-3 mm high, usually 4-5 and thin. Ecology: Found along streams and in canyons and stream beds from 3,000-4,500 ft (914-1372 m), flowers July-November. Distribution: Ranges across the upper Sonoran Desert and south into northern Sonora. Notes: The opposite cordate leaves, its vining habit and the non-glandular stems along with the 4-5 winged follicles are all key. Ethnobotany: Unknown Etymology: Matelea is thought to be named for the French botanist Jean Baptiste Cristophore Fusee Aublet (1720-1778), while arizonica means of or from Arizona. Synonyms: Gonolobus arizonicus, Lachnostoma arizonicum Editor: SBuckley, 2011
Gonolobus arizonicus image
Thomas Van Devender  
Gonolobus arizonicus image
Sue Carnahan  
Gonolobus arizonicus image
Sue Carnahan  
Gonolobus arizonicus image
Sue Carnahan  
Gonolobus arizonicus image
Sue Carnahan  
Gonolobus arizonicus image
Ana L. Reina-Guerrero  
Gonolobus arizonicus image
Gonolobus arizonicus image
Gonolobus arizonicus image
Gonolobus arizonicus image
Gonolobus arizonicus image
Gonolobus arizonicus image
Gonolobus arizonicus image
Gonolobus arizonicus image
Gonolobus arizonicus image
Gonolobus arizonicus image
Gonolobus arizonicus image
Gonolobus arizonicus image
Gonolobus arizonicus image
Gonolobus arizonicus image
Gonolobus arizonicus image
Gonolobus arizonicus image
Gonolobus arizonicus image
Gonolobus arizonicus image