114 BOTANY. 
Example: Erianthera. Prominent genera of the United States are Dianthera 
and Dipteracanthus. There are ee 105 genera, and 750 species in the 
entire family, according to Lindley. 
Acanthus mollis, Bec? s claw (Southern Europe) (pl. 62, fig. 2); a, portion 
of the flower, showing the stamens and the two lateral bracts; 6, anther; c¢, 
pistil; d, seed vessel; e. section of the seed. 
Ruellia formosa (pl. 62, fig. 1); a, calyx; 0, pistil. 
Orver 84. Verpenace#, the Vervain Family. Calyx tubular, persistent, 
inferior. Corolla monopetalous, tubular, hypogynous, deciduous, limb usually 
regular ; zstivation imbricated. Stamens usually four, didynamous, rarely 
equal, sometimes two. Ovary free, two- to four-celled; ovules usually 
four, erect or pendulous, anatropal or amphitropal ; ote one, terminal ;. 
stigma bifid or entire. Fruit nucamentaceous or baccate, composed of two 
or four achzenia united. Seeds one to four; albumen 0 or fleshy; embryo 
straight ; radicle cither inferior or superior. Trees or shrubs, rarely herbs, 
with opposite or alternate exstipulate leaves. The order has been divided 
mto three sub-orders:—1. Myoporinee, anthers two-celled, seed pendulous, 
radicle superior; natives of the southern parts of America and Africa, and 
of Australia. 2. Verbenew, anthers two-celled, seed erect, radicle inferior ; 
natives both of the tropical and temperate regions of America, and found 
also in Asia and Europe. 3. Selagine@w, anthers one-celled, seed pendu- 
lous, radicle superior ; natives chiefly of the Cape of Good Hope, but some ~ 
are European. There are seventy-five known genera, and upwards of 770 
species. Examples: Myoporum, Avicenna, Verbena, Vitex, Tectona, Selago, 
(Hobularia, 
Some American representatives of this family are Verbena, Phryma, and 
Lippia. The fragrant Verbena of horticulturists is the Aloysia citriodora. 
Tectona grandis furnishes the teak wood of India. 
Vitex agnus castus (Europe) (pi. 62, fig. 5, a-t). 
Orper 85. LasiatT x, the Mint Family. Calyx tubular, inferior, regular 
or hbilabiate, persistent. Corolla monopetalous, hypogynous, bilabiate ; 
upper lip entire or bifid, lower three-lobed. Stamens four, didynamous, 
semetimes two by abortion, inserted into the corolla, and alternate with 
the lobes of the lower lip; anthers two-celled, or one-celled by abortion, or 
by absorption of the septum; cennective sometimes large and distractile. 
Disk fleshy. Ovary free, deeply four-lobed; ovules four; style one, basilar ; 
stigma bifid, usually acute. Jruit consisting of one to four acheenia, 
inclosed within the persistent calyx. Seeds erect; albumen either 0, or m 
small quamtity; embryo erect; cotyledons flat; radicle inferior. Herbs 
or undershrubs, with tetragonal stems, opposite exstipulate leaves, and 
cymose inflorescence, the flower being often in verticillasters. Linnzeus 
looked upon the fruit as naked seeds, and hence included many of the 
plants in the order Gymnospermia of his Didynamous class. They are natives 
chiefly of temperate regions. Lindley mentions 125 genera, including 2,350 
species. 
Tribe 1. Ocimoidea. Stamens declined. Ex.: Lavandula. 
114 
