DICHONDRACEAE 



957 



disposed. Calyx of pai-tially 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. 



Gynoecium ot 2 distinct carpels. 



Gynoecium of 2 or more partially or wholly united carpels. 

 Fruit capsular or baccate : ovary not l-l6bed. 

 Styles or stigmas distinct. 



Ovary 1-2-celled, or rarely 4-celled : stigmas 2. 

 Ovary 2-celled or -1-celIed. 



Corolla unappendaged within: plants with normal leaves, 



at least if vines. 

 Corolla appendaged within : parasitic twining plants 

 with scale-like leaves. 

 Ovary 1-celled (2-celled in Nama). 

 Ovary 3-celled : stigmas S. 



Calyx-lobes imbricated : corolla mostly plaited in the bud. 

 Calyx-lobes valvate : corolla merely convolute in the bud. 

 Styles or stigmas wholly united. 



Median axis of the gynoecium in the same axis as the stem : 



seeds mostly pitted. 

 Median axis of the gynoecium not in the axis of the stem : 

 seeds mostly tuberculate. 

 Fruit drupaceous, or of 2 or 4 nutlets. 



Style or stigmas not furnished with a glandular ring. 



Fruit a group of 2 or 4 nutlets : style arising from between the 



lobes of the ovary. 

 Fruit drupaceous : style terminating the lobeless ovary. 

 Style or stigmas furnished with a glandular ring. 

 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. 

 Ovary 1-celled. 

 Style arising between the 4 lobes of the ovary. 

 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. 

 Corolla-lobes convolute : capsules elastically dehiscent. 

 Ovary 1-celled. 

 Placentae of the ovary parietal. 



Herbs parasitic on the roots of other plants: leaves scale-like: 



foliage not green. 

 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. 

 Ovary and capsule 1-celled : herbs : seeds wingless. 



Fam. 1. DiCHONDRACEAE. 



Fam. 2. CONVOLVULACEAE. 



Fam. 3. Cuscxjtaceae. 



Fam. 4. Hydroleaceae. 



Fam. 2. Convolvulaceae. 



Fam. 5. Polemoniaceae. 



Fam. 6. Solanaceae. 

 Fam. 13. Rhinanthaceae. 



Fam. 7. Borraginaceae. 

 Fam. 8. Ehretiaceae. 

 Fam. 9. Heuotropiaceae. 



Fam. 10. Verbenaceae. 

 Fam. 11. Phrymaceae. 

 Fam. 12. Lamiaceae. 



Fam. 13. Rhinanthaceae. 

 Fam. 14. Acanthaceae. 



Fam. 1.5. PiNGUlCULACEAE. 



Fam. 16. Orobanchaceae. 



Fam. 17. Bignoniaceae. 

 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 x-otate 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, utricie-like, iudehiscent. Seeds 

 usually solitary or two, with a smooth testa. 



1. DICHONDRA Forst. 



Characters of the family. 



1. Dichondra Carolinensis 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-ohovate, 



1 Another species, similar in habit, D. arr/entea WiWd., common westward, with silvery 

 silky-pubescent foliage and villous corolla-lobes, many occur in the western part of our 

 range. 



