MONOPETALOUS EXOGENOUS PLANTS. 445 



flotoers ; calyx free, 5-parted, imbricated in the bud, per- 

 sistent; corolla bell-shaped, funnel-shaped, or salver-form, 

 5-lobed, convolute in the bud ; stamens 5, distinct, insert- 

 ed on the tube of the corolla ; anthers mostly sagittate, 

 erect, introrse ; ;joZ/e?i granular; ovaries 2, distinct, their 

 styles united ; fruit few-many-seeded ; seeds anatropous 

 or amphitropous, naked, or bearing a tuft of down at the 

 apex (comose) ; embryo straight in scarce albumen. 



SYNOPSIS. 



* Fruit a many-seeded foUide. 

 t Seeds comose ; leaves opposite. 



Corolla beU-shaped, with scale-like appendages at the base of the lobes. Eerbs. 



Apoctitum. 



tt Seeds naked ; leaves opposite or alternate. 



Cor<Mafunnd-formed. Flowers panicled. Leaves alternate Amsonia. 



APOCYNUM, Tourn. Indian Hemp. 



Calyx 5-parted; corolla bell-shaped, 5-lobed, with scale- 

 like appendages at the base of the lobes ; stamens inserted 

 on the base of the corolla; «w^//er6* sagittate; stigma ses- 

 sile, 2-lobed; follicles long and slender; seeds numerous, 

 obovoid, comose. — Perennial erect branching Jierbs, with 

 opposite oval or oblong mucronate petioled leaves, and 

 small ^vhite Jloicers in lateral and terminal cymes. 



A. CANNABINUM, L. Stem smooth, with erect branches ; 

 leaves oval or oblong, mucronate, pubescent beneath ; 

 cymes terminal, close-flowered, shorter than the leaves ; 

 calyx-lohQS, lanceolate, as long as the tube of the greenish- 

 white corolla J lobes of the corolla erect. Stem 2°-3° high ; 

 leaves 2-3' long; corolla 2" long. 



AMSONIA, Walt. 

 Calyx small, 5-parted; corolla funnel-form, 5-lobed, 



