Dicotyls or Exogenous Plants. 79 



1. Genus AES'-CU-LUS.— Calyx tubular, 5-lobed; petals 4 or 5; 

 stamens 7 (or 6 or 8) ; fruit a leathery pod ; trees or shrubs. 



Aes'-cu-lus glab'-ra Wilkl. Fetid or Ohio Bucl<eye. — Fruit covered 

 ■with prickles when young; stamens longer than the corolla; leaflets 

 usually 5. 



Aes'-cu-lus oc-tan'-dra Marsh. {Ae. /lava Ait.) Sweet Buckeye. — 

 Fruit smooth ; stamens included in the corolla ; leaflets 5, sometimes 

 7, glabrous or often minutely downy beneath ; bark of trunk whiter 

 than in the preceding. 



LII. Order RHAM-NA'-CE-/E. BUCKTHORN FAIVIILY. — Shrubs or 

 small trees, flowers small, regular, sometimes apetalous, stamens peri- 

 gynous, inserted opposite the petals. 



Petals small or none, drupe berry-like Rhamnits. 1 



Petals long-clawed, hooded, fruit drj' Ccaiiotlius. 2 



1. Genus RHAIVI'-NUS. — Calyx 4 to 5-cleft ; shrubs or small trees, 

 with greenish polygamous or dioecious flowers in axillary clusters. 



Rham'-nus al-ni-fo'-li-a L'Her. Bucktiiorn. — Cahx-lobes and stamens 

 5, petals wanting; leaves oval, serrate; low shrub, in swamps. 



Rham'-nus lan-ce-o-ia'-ta Ph. Buckthorn, — Calyx-lobes, petals and 

 stamens 4 ; leaves oblong-lanceolate and acute or on flowering shoots 

 oblong and obtuse, finely serrulate; tall shrub. 



2. Genus CE-AN-O'-THUS.— Calj-x 5-lobed, incurved, petals hooded 

 on spreading claws; filaments elongated; fruit 3-lobed, dry. 



Ce-an-o'-thus a-mer-i-ca'-nus L. New Jersey Tea; Red-root. — Leaves 

 ovate or oblong-ovate, 3-ribbed, serrate; the common peduncles elon- 

 gated. 



Ce-an-o'-thus o-va'-tus Desf. Red-root. — Leaves narrowly oval or 

 elliptic-lanceolate, finely glandular-serrate; common peduncles short. 



LIIL Order VI-TA-CE-^. VINE FAIVIILY.— Shrubs usually climbing 

 by tendrils; flowers regular, calj-x minute or truncate, stamens oppo- 

 site the ver}- deciduous petals ; leaves palmately veined or compound. 



Corolla caducous without expanding ; leaves simple Vitis. 1 



Corolla expanding ; leaves digitate Parthenocissiis. 2 



