MADDER FAMILY. Rubiaceae.
A large family, widely distributed, chiefly tropical. Ours are herbs, or shrubs; leaves opposite or in whorls; flowers regular, usually perfect; calyx with four teeth or none; corolla with four or five united lobes, often hairy inside; stamens on the corolla, as many as its lobes and alternate with them; ovary inferior, with one or two styles; fruit a capsule, berry, or stone-fruit. Coffee, Quinine, and Madder, used for dye, belong to this family. I am told that the latter plant is escaping around Salt Lake and is well established there. The Latin name means "red."
There are many kinds of Houstonia, North American, usually growing in tufts, leaves opposite; flowers small; calyx four-lobed; corolla funnel-form or salver-form, four-lobed; style slender, with two long stigmas; fruit a capsule. Sometimes the flowers are perfect, but usually they are of two kinds, one kind with high anthers and short pistil, the other kind with long pistil and anthers inside the corolla-tube; visiting insects carry pollen from the high anthers of the one to the high stigmas of the other, and from the low anthers to the low stigmas, thus ensuring cross-pollination.
Desert Innocence
Houstònia rùbra
Pink and white
Summer
Arizona
A pretty little desert plant, about two inches high, forming close tufts of sage-green foliage, like harsh moss, with stiff needle-like leaves and woody stems, sprinkled with charming little pink and white flowers. The corolla is three-eighths of an inch across, with a long slender tube, the stamens lilac, and the odd little nodding capsules have two round lobes. This grows in the dreadful sandy wastes of the Petrified Forest.
Kelloggia
Kellóggia galioìdes
Spring, summer
White, pink, yellowish
West, etc.
The only kind, a slender little plant, from six inches to a foot tall, usually with smooth leaves, with small stipules. The tiny flowers are white, pink, or greenish-yellow, with a bristly calyx, and the corolla usually has four petals, but sometimes five or three; the stigmas two. The fruit is covered with hooked bristles. This grows in mountain woods, as far east as Wyoming.
Kelloggia galioides.
Desert Innocence—Houstonia rubra.
There are many kinds of Galium, widely distributed; sometimes shrubs; stems square; leaves in whorls, without stipules; flowers small, usually perfect, in clusters; calyx usually with no border; corolla wheel-shaped, four-lobed; stamens four, short; ovary two-lobed; styles two, short, with round-top stigmas; fruit dry or fleshy, consisting of two similar, rounded parts, each with one seed. The common name, Bed-straw, comes from a tradition that the manger of the Infant Christ was filled with these plants. Other names are Goose-grass and Cleavers.