Dicotyls or Exogenous Plants. 37 



1. Genus PHO-RA-DEN'-DRON.— Yellowish-green woody parasites 

 on various deciduous trees ; leaves thick, firm, persistent ; berry 

 globose, white. 



Pho-ra-den'-dron fla-ves'-cens (Ph.) Nutt. False Mistletoe.— In south- 

 ern Ohio. 



XVIII. Order SAN-TA-LA'-CE-yE. SANDALWOOD FAMILY. — Herbs 



with entire leaves; calyx-tube adherent with the 1-celled ovary. 



1. Genus CO-MAN'-DRA.— Cah'x bell-shaped or urn-shaped; low 

 smooth perennial herbaceous plants with greenish white flowers. 



Co-man'-dra um-bel-la'-ta (L.) Nutt. False Toad -Flax.— Leaves oblong, 

 1 in. long ; fruit globular urn-shaped. 



XIX. Order A-RIS-TO-LO-CHI-A'-CE->E. BIRTHWORT FAMILY.— Herbs; 



flowers perfect, apetalous, the caU^ conspicuous, cohering with the 6- 

 celled ovary. 



1. Genus AS'-A-RUM.— Calyx regular, bell-shaped, the limb 3-cleft 

 or parted ; rootstocks creeping, aromatic. 



As'-a-rum can-a-den'-se L. Wild Ginger. — Soft pubescent; a single 

 pair of large kidne3'-shaped leaves ; calyx brown-purple inside. 



XX. Order PO-LYG-0-NA'-CE-/E. BUCKWHEAT FAMILY. — Herbs; 



flowers apetalous ; stipules in the form of sheaths (called ochrecs) ; 

 joints of the stem swollen. 



1. Genus RU'-MEX.— The 3 inner sepals enlarged after flowering 

 (in fruit called valves) veiny, often with a grain-like tubercle on the 

 back; flowers small, mostly green, in panicled racemes. 



Ru'-mex a-ce-to-sel'-la. Field or Sheep Sorrel. — Low, 6-12 in. high; 

 leaves narrow lanceolate or linear, the lowest halbred-form. 



XXL Order AI-ZOI-DA'-CE-/E. INDIAN CHICKWEED FAMILY.— Leaves 



opposite, exstipulate ; petals wanting ; low herbs. 



1. Genus MOL-LU'-GO. — Sepals 5, white inside, petals none, sta- 

 mens 5, stigmas 3, capsule 3-celled; prostrate plants. 



