Ill MONCECIA. 



contained in a bract, or involucre of 1 leaf; ovary 

 3-lobed, 3-seeded. Herbaceous plants abounding in 

 acrid, milky juice, branched principally above, and bear- 

 ing many green flowers. SPURGE TRIBE. P. 549. 



2. CALLITRICHE. Ovary 4-lobed ; styles 2. Small 

 aquatic plants with opposite leaves, inconspicuous 

 axillary flowers without petals, and 4-seeded fruit. 

 WATER-STAR WORT TRIBE. P. 558. 



3. ZANNICHELLIA. Ovaries 4, styles 4. A submersed 

 aquatic plant with numerous slender stems, linear leaves, 

 and inconspicuous green flowers. 4. ZOST^RA. Ovaries 

 4 ; style 1, 2-cleft. A submersed marine plant, with 

 long, grassy leaves, some of which are sheathing at the 

 base, and contain barren and fertile flowers without 

 petals, arranged alternately in 2 rows on a common 

 stalk. POND-WEED TRIBE. P. 644. 



5. ARUM. Stamens and pistils arranged in separate 

 rings round a common central column or spadix. A 

 curious herbaceous plant with large, glossy leaves, from 

 among which rises a sheath containing a solid crimson 

 column bearing a ring of stamens about the middle, 

 and a row of pistils beneath. CUCKOO-PINT TRIBE. 

 P. 639. 



ORDER II. DIAKDKIA. 2 Stamens. 



6. CALLITRICH& Ovary 4-lobed ; styles 2. Aquatic 

 plants with opposite leaves, inconspicuous, axillary 

 flowers without petals, and 4-seeded fruit. WATER- 

 STARWORT TRIBE. P. 558. 



7. LEMNA. Ovary 1 -celled; style 1; stigma 1. 

 Minute, stemless, aquatic, floating plants, consisting 

 entirely of a few thread-like roots and fleshy leaves, 

 embedded in which last flowers are produced, but rarely. 

 DUCKWEED TRIBE. P. 643. 



8. CAREX. Inflorescence in ' terminal spikes formed 

 of chaffy scales or glumes, with a flower at the 



