ASCLEPIADACEAE 1 51 



eobinate. — On wet prairies especially in the valleys of the Big and Little 

 Blue and Fire Prairie Creek. Abundant locally. June-July. 



5. A. amplexlcaulis J. E. Smith. l°-2i° high, glabrous: leaves ovate- 

 orbicular, clasping : umbel usually solitary : follicles glabrous, erect on 

 the decurved fruiting pedicels. — Locally frequent on dry prairies and 

 banks near Waldo Park, Lee's Summit, Grand Vietv, Lake City and 

 Buckner May-June. 



6. A. Syriaca L. Common Milkweed. 2°-5° high, finely pubes- 

 cent : leaves oval-oblong, short-petioled, pubescent : umbels several : 

 follicles erect on the decurved fruiting pedicels, densely tomentose and 

 eobinate. — Abundant throughout in fields and waste places. July-Sep- 

 tember. 



7. A. vertioillata L. WerTS Milkweed. 1°-3° high, pubescent : 

 leaves long-linear, numerous : flowers white : glabrous follicles and fruit- 

 ing pedicels erect. — Not uncommon in dry fields and prairies throughout. 

 June-July. 



2. ASCLEPIODOBA A. Gray. 



Eesembles Asclepias, but corolla lobes spreading. Hoods hornless, 

 crested within. 



1. A. viiidis (Walt.) A. Gray. Green Milkweed. 1°-2° high, gla- 

 brous : leaves opposite or alternate, ovate-oblong, short-petioled, mucro- 

 nate : flowers 1' broad, greenish with a purplish hood. — Eare and local in 

 dry soil near Pixley's, Lee's Summit, Grain Valley and Grand View. 

 June. 



3. ACERATES Ell. Milkweed. 



Differs from Asclepias in the hornless hoo's. 



Flowers white. 1. A. angustifuUa. 

 Flowers greenish. 



Crown sessile. 2. A. viridiflora. 



Crown on a short column. 3. A. Floridana. 



1. A. angustifoUa (Nutt. ) Dec. Pbaieie Milkweed. 1°-2° high, 

 slightly puberulent : leaves elongated-linear : umbels axillary, short- 

 peduncled or sessile : hoods three toothed at the apex. — Locally frequent 

 on rooky prairies near Waldo Park, Grand View and Lee's Summit. 

 June-July. 



2. A. viridiflora (Eaf.) Eaton. Geben Milkwebd. 1°-3'' high, 

 downy to glabrate : leaves oval or oblong-ovate : umbels sessile or short- 

 peduncled : hoods about equalling the anthers : hoods entire. — Eather 

 rare in dry rooky places near Waldo Park and Lee's Summit. June- 

 August. 



Var. Ivesil Britton. Leaves oblong-lanceolate. — Dry places through- 

 out especially in the southern part, but not abundant. 

 Var. linearis A. Gray. Leaves linear. — Prairies near Buckner. 



3. A. Floridana (Lam.) Hitchcock. l°-3° high, glabrate to hairy : 

 leaves linear-lanceolate : umbels peduncled : hoods much shorter than 



