244 FAMILIES OF FLOWERING PLANTS. 
western States. In the tribe Ixoreae is contained the genus Coffea, or 
coffee, one of the important staples of the tropics. The related genus 
Izora includes some trees with very hard, tough wood, notably the West 
Indian ironwood (Ixora ferrea). 
Our native Rubiaceous plants are limited in the northern states to 
the partridge-berry, Mitchella (Fig. 211), the various species of Houstonia 
or bluets (Fig. 212) and the bedstraws (Galium), the latter homely insig- 
nificant weeds. (Fig. 218). 
Family Caprifoliaceae. Honeysuckle Family. Consist of about 
10 genera and and 260 species, mostly of the 
northern hemisphere. They are shrubs, trees, 
vines, or even herbs, having opposite leaves 
ordinarily without stipules, and mostly cymose 
flowers. Calyx 3-5-toothed. Corolla 5-lobed, 
yy occasionally bilabiate. Stamens 5 or 4, borne 
on the tube of the corolla. Ovary inferior, 1-6- 
celled, becoming in fruit a berry, drupe or 
capsule. 
The honeysuckles form a very attractive 
group, most of the genera being ornamental in 
cultivation. Lonicera, which includes all the 
true honeysuckles, is a genus of shrubby vines, 
many with evergreen foliage, and all having 
oe 
Fic. 212, Bluets (Houstonta 
coerulea), One-half natural size. 
Original. 
flowers with great beauty of ~ 
form and diversity of color; 
they are also very fragrant. 
Viburnum consists of shrubs and 
trees, of which the snowball tree 
is a good example; there are 
many native species. (Fig. 214.) 
The dainty little twin-flower of 
uorthern regions, Linnaea bor- 
ealis, is another number of this Fic. 213. A native species of Bedstraw (Galium 
family. In the west occur sev- coer: After Britton and Brown, Ill. Fl. North- 
eral species of undershrubs with small bell-shaped flowers and white 
