DICHONDRACEAE 957 
disposed. Calyx of partially united sepals. Corolla gamopetalous, regular or 
irregular. Androecium of as many stamens as there are corolla-lobes, or fewer, 
sometimes partially represented by staminodia, sometimes partially obsolete. 
Gynoecium of 2 distinct or several united carpels. Fruit a capsule, berry, drupe 
or a group of nuts, or utricle-like. 
Stamens 5. i 
Gynoecium of 2 distinct carpels. Fam. 1. DICHONDRACEAE. 
Gynoecium of 2 or more partially or wholly united carpels. 
Fruit capsular or baccate : ovary not 4-lobed. 
Styles or stigmas distinct. 
Ovary 1-2-celled, or rarely 4-celled : stigmas 2. 
Ovary 2-celled or 4-celled. 
Corolla unappendaged within: plants with normal leaves, 
atleastif vines. Fam. 2. CONVOLVULACEAE. 
Corolla appendaged within: parasitic twining plants 
with scale-like leaves. "am. 3. CUSCUTACEAE. 
Ovary 1-celled (2-celled in Nama). Fam. 4. HYDROLEACEAE. 
Ovary 3-celled : stigmas 3. 
Calyx-lobes imbricated : corolla mostly plaited in the bud. Fam. 2. CONVOLVULACEAE. 
Calyx-lobes valvate: corolla merely convolute in the bud. Fam. 5. POLEMONIACEAE. 
Styles or stigmas wholly united. 
Median axis of the gynoecium in the same axis as the stem: 
seeds mostly pitted. Fam. 6. SOLANACEAE. 
Median axis of the gynoecium not in the axis of the stem: 
seeds mostly tuberculate. Fam. 13. RHINANTHACEAE. 
Fruit drupaceous, or of 2 or 4 nutlets. 
Style or stigmas not furnished with a glandular ring. 
Fruit a groupof 2or 4 nutlets : style arising from between the 
lobes of the ovary. Fam. 7. BORRAGINACEAE. 
Fruit drupaceous : style terminating the lobeless ovary. Fam. 8. EHRETIACEAE. 
Style or stigmas furnished with a glandular ring. Fam. 9. HELIOTROPIACEAE. 
Stamens 4 and didynamous, or 1 or 2. 
Carpels ripening into a group of 4 nutlets, an achene or a drupe. 
Style apical on the lobeless ovary. 
Ovary 2-celled. [ Fam. 10. VERBENACEAF. 
Ovary 1-celled. Fam. 11. PHRYMACEAE. 
Style arising between the 4 lobes of the ovary. Fam. 12. LAMIACEAE. 
Carpels ripening into a capsule. 
Placentae of the ovary axile. 
Ovary 2-celled, or rarely 3-5-celled. 
Corolla-lobes imbricated : capsule not elastically dehiscent. Fam. 13. RHINANTHACEAE. 
Corolla-lobes convolute : capsules elastically dehiscent. Fam. 14. ACANTHACEAE. 
Ovary 1-celled. Fam. 15. PINGUICULACEAE. 
Placentae of the ovary parietal. : 
Herbs parasitic on the roots of other plants: leaves scale-like: 
foliage not green. Fam. 16. OROBANCHACEAE. 
Trees, shrubs or woody vines, or herbs, but not parasitic: leaves 
not scale-like: foliage green. : 
Ovary and capsule 2-celled: trees, shrubs or woody vines: 
seeds winged. Fam. 17. BIGNONIACEAE. 
Ovary and capsule I-celled: herbs: seeds wingless. Fam. 18. MARTYNIACEAE. 
FAMiLY 1. DICHONDRACEAE Dumort. DICHONDRA FAMILY. 
Annual or perennial herbs, with creeping stems. Leaves alternate ; blades 
about as broad as long or broader, entire. Flowers solitary in the axils, com- 
monly pedicelled. Calyx of 5 distinct or nearly distinct sepals, sometimes slightly 
broadened upward. Corolla rotate or campanulate, 5-lobed, the lobes induplicate 
in the bud.  Androecium of stamens 5, shorter than the corolla. Filaments fili- 
form or subulate. Gynoecium of 2 distinct carpels, pubescent. Styles 2, distinct, 
basal. Stigmas capitate. Capsules 2 together, utricle-like, indehiscent. Seeds 
usually solitary or two, with a smooth testa. 
1. DICHONDRA Forst. 
Characters of the family. 
. lL Dichondra Carolinénsis Michx.! Perennial, softly pubescent. Stems creep- 
ing, 1-4 dm. long, often branching: leaf-blades reniform or suborbicular, 5-20 mm. 
broad, rounded or retuse at the apex, entire, cordate ; petioles much longer than the 
blades: pedicels shorter than the petioles: calyx silky ; lobes cuneate or cuneate-obovate, 
.. } Another species, similar in habit, D. argentea Willd., common westward, with silvery 
silky-pubescent foliage and villous corolla-lobes, many occur in the western part of our 
range. 
