MILKWEED FAMILY 105 



Stems twining. 



Stamen-column without appendages; corolla-lobes cucullate 1. Astephantjs. 



Stamen-column with appendages ; corolla-lobes plane. 



Appendages of the stamen-column attached at base, scale-liie 2. Philibertia. 



Appendages plate-like, uniting the stamen-column with a corolla-like crown 



3. GoNOLOBtrs. 

 Stems never twining ; stamen-column with appendages. 



Corolla-lobes reflexed ; hoods distinct, adnate to the stamen-column above the base. 



Stems strongly flattened, prostrate 4. Solanoa. 



Stems terete, commonly strictly erect, rarely decumbent 5. Asclepias. 



Corolla-lobes rotate ; hoods inserted at base of stamen-column, joined to each other by a lobed 



disk 6. ASCLEPIODORA. 



1. ASTEPHANUS R. Br. 



Stems in ours slender, twining. Flowers small, in axillary umbels. Corolla 

 short-campanulate, shortly 5-clef t, glabrous. Appendages of the corolla or stamen- 

 column none." — Species 12, North and South America, 

 Africa. (Greek astephanos, crownless.) 



1. A. utahensis Engelm. (Fig. 350.) Stems many 

 from the crown of a taproot, diffuse or a.scending, 9 to 

 15 inches long; herbage nearly glabrous; leaf -blades nar- 

 rowly linear, acuminate, % to l^i inches long, spreading 

 or often reflexed; umbels 7 to 16-flowered, the pedicels 2 

 to 3 lines long; flowers ocher-colored, 1 to 1^/4 lines broad; 

 caljrx-lobes subulate or lanceolate; corolla glabrous, sub- 

 campanulate. shallowly cleft, its short lobes cucullate with ^ZuE^!is:EngeZ^tong. 

 the points inflexed, so that the throat is almost closed; sta- gggt. of fl., x 11. 

 men appendages none. 



Gravelly valleys, 500 to 2500 feet : Colorado Desert; southeastern Mohave Des- 

 ert. East to Arizona and southern Utah. Apr. -June. 



Locs. — San Felipe, S. B. 4- W. F. Parish 1402 ; Coyote Holes, east of Warrens Well, Jepson 

 5966; Nipton, ace. P. A. Mum. 



Refs. — ASTEPHANUS UTAHENSIS Engelm., Am. Nat. 9 :349 (1875), type loc. St. George, Utah, 

 Parry; Jepson, Man. 770, fig. 756 (1925). 



2. PHILIBERTIA H.B.K. 



Stems in ours twining. Flowers small, dull purplish or yellowish, borne in axil- 

 lary umbels. Calyx and corolla 5-parted or -cleft. Corolla deeply lobed, with a 

 membranous ring adnate to it at base, pubescent on the outside. Stamen-column 

 short, with 5 scales at base. — Species 30, South ^^nerica, southern North America. 

 (J. C. Philibert, editor of a French dictionary of botany, 1804.) 

 Herbage glabrous or nearly so ; leaf -blades linear to lanceolate, auriculately or obtusely lobed at 



base; corolla purplish, its base bearing a narrow but distinct wing-like crown 



1. P. heterophylla. 

 Herbage vUlous-puberulent ; leaf -blades tapering or acute at base; corolla greenish-yellow, with- 

 out crown 2. P. hirtella. 



1. P. heterophylla Jepson. Climbing Townula. Stems 2 to 4 or 8 feet long, 

 climbing freely; herbage green, thinly puberulent or glabrous; leaf -blades com- 

 monly linear (1 line wide), varying to lanceolate (5 lines wide), obtuse, acute or 

 auriculately lobed at base, 1 to 2 inches long, .shortly petioled; pedicels 3 to 6 lines 

 long; flowers 4 to 5 lines broad; calyx-lobes ovate-lanceolate, very acute; corolla 

 purplish, its lobes elliptic-ovate, purple-veined, 2 lines long; base of corolla bearing 

 a narrow but distinct wing-like crown; stamen appendages roundish-ovate, as broad 

 or broader than long. 



Dry slopes and flats, 100 to 2000 feet : Colorado Desert and westward toward 

 the coast. East to Texas, south to Lower California and Mexico. IMar.-July. 



