ORDEU 97. ASCLEPIADACE^S. 591 



III. GONOLOBE^E. Filaments connate, Pollinia 10, in pairs, horizontal, (c) 



c Corolla wheel-shaped. Plants twining, with cordate leaves GOXOLOBUS. S 



IV. STAPKLIK^E. Filaments connate. Pollinia 10, ascending or erect, (d) 



d Crown simple, of 5 fleshy segments. Twining. Cultivated I!OYA. 9 



d Crown double, an outer and an inner. Not twining. Cultivated STAPELIA. 10 



1. PERIP'LOCA, L. (Gr. Kepi, around, TrAo/KOf, a binding or twin- 

 ing ; from the habit of tho plant.) Calyx minute; corolla rotate, flat, 

 5-parted, orifice surrounded by a 5-cleft, urceolate corona, terminating 

 in 5 filiform awns ; filaments distinct, anthers cohering, bearded on the 

 back; pollinia solitary, 4-lobed; follicles 2, smooth, divaricate; seeds 

 comous. Twining shrubs. Fls. in umbels or cymes. 



P. Grseca L. Lvs. ovate, acuminate; corymbs axillary; cor. villoua within. A 

 climbing shrub, 10 15f long, sparingly naturalized in Western N. Y., also culti- 

 vated in gardens. Leaves opposite, 3 4' long, J as wide, and on petioles J' long. 

 Flowers in long, branching, axillary peduncles. Sepals minute, lanceolate, acute. 

 Petals very hairy within, linear, obtuse, dark purple. Follicles about 2' long. 

 Aug. S. Eur. 



2. ASCLE'PIAS, L. MILK WEED. (From Esculapius, the fabulous 

 god of medicine and physicians.) Calyx deeply 5-parted; corolla deeply 

 5-partcd, valvatc in aestivation, finally reflexed ; staminal corona 5- 

 Icavecl, leaflets cucullate, with an averted horn-like process from the 

 base curved towards the stigma ; nntheridium (connate mass of anthers) 

 o-angled, truncate, opening by 5 longitudinal fissures ; pollinia (masses 

 of pollen) 5 distinct pairs fixed by the attenuated apex to a cleft gland, 

 pendulous ; follicles 2, ventricous; seeds comous. 2 Mostly N. Ameri- 

 can, with opposite, verticillatc. rarely alternate Ivs. Umbels between 

 the petioles. 



Leaves linear. Ions and narrov/ (lance-linear in tlic cultivated No. 19). (*) 



* Leaves all opposite, or rarely the hishvst alternate Nos. 17 19 



* Leaves mostly scattered or verticillate Nos. 15, 1C 



Leaves broader, ovate, lanceolate, ic. Plants all native. (2) 



2 Steins dividing above into branches, corymbod or paniclcd Nos. 13, 14 



2 Stems siinplo. Leaves sessile, cordate-clasping at base Nos. 11, 12 



2 Stems simple. Leaves petiolate, the petioles often quite short. (3) 



3 Flowers (small) with a white crown and purplish-white corolla Nos. S 10 



3 Flowers with a white crown and greenish-white corolla Nos. 5 7 



3 Flowers (large) with both crown and corolla purple-tinged. (4) 



4 Follicles smoothish (as arc all tho foresoing) Nos. 3, 4 



4 Follicles sprinkled with soft warty spines Nos. 1, 2 



1 A. cornuti Decaisne. Simple, stout ; Ivs. oblong-ovate, short-acuminate, shorl- 

 petiolate, downy beneath ; pedicels shorter than the leaves, densely many-flow* 

 ered ; cor. lobes ovato reflexed, 4 times shorter than tho pedicils ; hoods of the 

 crown ovate, obtuse, not longer than the uncinato horn. A common, very milky 

 herb, 3 to -if high, in hedges and road-sides. Lvs. 5 to 8' by 2 to 3'; veinlets, 

 aa in most species, nearly at right angles to the midvein. Pcd. stout, between 

 the petioles, bearing a globular umbel of a hundred greenish purple flowers, few 

 of which prove fruitful. Pods full of seeds with their long silk. JL 



2 A. Sullivantii Engel. Tall, very smooth ; Ivs. ovate-oblong, erect, cordate, on 

 very short petioles ; hoods of the crown obovaie, obtuse and entire at apex, obtusely 

 auriculato without on each side at base ; horns slender but obtuse ; follicles with 

 scattered, warty spines. Near Columbus, Ohio (" Sullivant." Mr. A. II. Watson). 

 Said to resemble A. cornuti in foliago and fruit, but remarkably different in its 

 crown. Petals 4 to 5" long, greenish purple. Hoods twice as long as the an- 

 thers. Jl. 



3 A. purpurascens L. St. simple, erect, puberulent; Ivs. elliptical, ovate-ellip- 

 tical or ovate, mucronate, narrowed at base into a short- petiole, smooth above, 

 tomentous-pubescent and paler beneath; ped. terminal, shorter than the leaves; 

 hoods oblong or lance-ovate, obtuse, horns falcate, acute, abruptly bent to hori- 

 zontal. la hedges and thickets, N. II., Mass, to Wis. and Ky. St. 3f or more 



