CXL. ORCHIDACE ZX. 529 
Conspectus of the Genera. 
cordate, petiolate, “2 Oe ee Be 
} shor and verticillate, sessile. Flowers axillary, solitary. . : , «6 SORT et 
eaves ( long, linear, radical. Flowers elevated on long scapes. ‘  .« « « . Vallioneria. 2 
Br 1 HYDROCHARIS. 
Gr. tdwp, water, yaow, to rejoice ; as water is its own element. 
Flowers ¢ 2.—Spathe 2-leaved; calyx 3-parted; corolla of 3 pe- 
tals ; styles 3, abortive in the @; sta. 10—12, infertile in 9; stig. 
6—8, bifid, with several barren filaments and 3 nectariferous glands ; 
caps. inferior, 6-celled, 00-seeded.— Floating aquatics. 
H. sponcidsa. Bose. (H. cordifolia. Nutt.) Frogbit. 
Lvs. roundish-cordate; 3 fis.on long peduncles, Q on short ones; anth. 
linear ; stig. 6—7, 2-parted nearly to the base; segments lanceolate-subulate.—2 
Braddock’s bay, L. Ontario, Sartwell. Stems jointed, producing offsets from 
which new plants arise. Root somewhat fibrous. Leaves petiolate, 5-veined, 
purplish beneath. peduncles about 3’ long. Sepals oval, green. Q pedun- 
cles 1—13’ long, thick. Ovary oblong. Seeds hirsute, Petals white. Aug. 
2,.UDORA. Nutt. 
Gr. idwoe, water; from its aquatic habits. 
Flowers o' 2; spathe bifid ; spadix 1-flowered. of Stamens 9, 3 of 
them interior. Y Tube of the perianth very long ; abortive filaments 
3; capsule véntricose, 3-seeded—Creeping. Lvs. verticillate. 
U. Canapensis. Nutt: (Elodea. Michz. Sepicula verticillata. Mudl.) 
Ditch Moss.—Lvs. verticillate, in 3s and 4s, lanceolate, oblong or linear, 
serrulate ; tube of the perianth filiform.—Resembling a coarse moss, in still 
waters. Stem filiform, diffusely dichotomous, very leafy, submersed. Leaves 
3—6” by (less than) 1”, thin and diaphanous, sessile, obtuse. Flowers axillary, 
solitary, minute, of a dingy white, the slender, hair-like tube 2—3’ long (4—6! 
according to Nuttall), the lower part (pedicel?)2-margined. Stigmas recurved 
between the segments, crested with glandular hairs. Aug. 
3. VALLISNERIA. 
’ In honor of Anthony Vallisner, a French botanist. 
Flowers 32; spathe ovate, 2—4-parted. o Spadix covered with 
minute flowers; corolla 0. @ Spathe bifid, 1-flowered; perianth 
elongated ; sepals linear; stigmas 3, ovate, bifid; capsule 1-celled, 
many-seeded.—% Submersed. Lvs. all radical. Scape spiral, very long. 
V. Americana. Michx. Tupe Grass. | 
Lvs. linear, obtuse, serrulate at the end, tapering at the ‘base, floating ; 
peduncle of the fertile flower long, of the sterile short, erect—A curious plant, in 
slow moving or stagnant waters, U. S. Leaves linear, 1—2f long, about 4/ 
wide, the edges thinner than the middle. Scapes several, of the sterile plants 
short, of the fertile plants very tortuous, 2—4f long when extended, thread-like, 
thickened at top, bearing each a single, white flower at or near the surface. 
ite and petals crowning the (1’) long, narrow, incurved ovary, which is 
half cencealed in the spathe. July, Aug. 
4 
LOrver CXL. ORCHIDACEAlL—Orcums., 
Pol. either powdery, or cehering in waxy masses (pollinia), which are either eonstantly edhering toe & 
gland, or becoming loose in their cells. . 
