CAEDUACEAE. 147 



^■tf - 3. V. cinerea (L.) Less. Stem cinereous-pubescent, corymbose above, 1 m. 

 tall or less: leaf -blades ovate to oblong-ovate, mostly 2-8 cm. long shallowly 

 toothed, paler beneath than above : peduncles slender : involucres 4-5 mm. high ; 

 bracts subulate to linear, acuminate: corollas about 4 mm. long: achenes about 

 1 mm. long, terete or nearly so: pappus white. — Hammocks and cultivated 

 grounds, U. keys. Nat. of Asia. — {Bah., Cuba, Ant.) 



j^X ^ 2. AGERATUM L. Perennial rigid herbs or shrubby plants. Leaves 

 opposite, or alternate above: blades usually toothed. Heads usually corymbose. 

 Involucres campanulate. Corolla-lobes erect, deltoid. Anther-appendages ovate. 

 Achenes 5-angled, short. Pappus of several short or long scales. 



i-l* 1. A. littorale A. Gray. Stems 3-7 dm. tall, glabrous: leaf -blades ovate, 1-5 

 em. long, crenate-serrate, succulent: bracts of the involucre ciliolate, the inner 

 becoming 3.5 mm. long: corollas blue, glabrous: achenes 2 mm. long, glabrous. 

 — Hammocks and sandy shores, L. keys. 



3 ^ ' 3. OSMIA Sch. Bip. Perennial herbs or shrubby plants. Leaves oppo- 

 site: blades broadest below the middle. Heads borne in corymbs. Involucre 

 ovoid or thick-cylindric. Corolla-lobes ovate or rounded. Anther-appendages 

 triangular. Achenes angled. Pappus of capillary bristles. 



Bracts of the involucre 5-7-ribbed : receptacle convex. 1. O. frustrata. 



Bracts of the involucre 3-ribbed : receptacle flat. 2. O. odorata. 



if- 1. O, frustrata (B. L. Robinson) Small. Stems 5-10 dm. tall, minutely 

 pubescent: leaf-blades ovate-lanceolate to deltoid-ovate, 2-3 cm. long, rather 

 obtuse: involucres 6-8 mm. long: corollas about 4 mm. long. {Euimtorium 

 heteroclinum Chapm. Not Griseb. Eupatorium frustratum B. L. Robinson.] — 

 Hammocks, U. keys, L. keys. 



■:'■'■ 2. O. odorata (L.) Sch. Bip. Stems 6-18 dm. tall, pubescent: leaf -blades 

 ovate to lanceolate, 4-10 cm. long, acuminate: involucres 8-10 mm. long: corol- 

 las about 5 mm. long. — [0. conyzioides (Vahl.) Sch. Bip.] — Hammocks, U. 

 keys. — {Ball., Cuha, Ant.) 



4. MIKANIA Willd. Vines. Leaves opposite, herbaceous: blades of a 

 hastate or deltoid type, mostly toothed. Heads borne in corymbs. Involucre 

 eylindric. Corollas with a campanulate throat: lobes lanceolate to triangular- 

 ovate. Androecium exserted: anther-appendages ovate. Achene angled. 

 Pappus of many capillary bristles. [Willughaeya Neck.] — Climbing hemp- 

 weed. 



Bracts of the involucre acute : corollas about 3 mm. long ; lobes ovate. 



1. If. batatifoJia. 

 Bracts of the involucre obtuse : corollas about G mm. long ; lobes 



linear-lanceolate. 2. M. corcUfolia. 



I 

 <" •• 1. M. batatif olia DC. Plants glabrous : leaf -blades deltoid to hastate-ovate, 



1-3 cm. long, entire or repand: heads in small irregular clusters: bracts of the 

 involucre 3-4 mm. long: corollas about 3 mm. long. [Willugbaeya hetero- 

 phylla Small.] — Hammocks and low pinelands, U. keys, L. keys. — [E. K.] — 

 {Bah., Cuba, Ant.) 



^''C '. 2. M. cordifolia (L.) Willd. Densely pubescent. Stems striate: leaf -blades 

 ovate to hastate, 6-15 cm. long, coarsely toothed, or lobed, cordate at the base: 

 corymbs rounded or rather flat-topped: heads numerous: involucres narrow, but 

 rather stout ; bracts oblong to linear-oblong, 7-8 mm. long, obtuse : corollas 

 about 6 mm. long. — Hammocks, U, keys. — [E. K.] — {Cuba, Ant.) 



