110 ALISMACES. 
1. ALISMA, Linnzus. 
1, A. Plantago, L. Scape with branches in whorls: leaves ovate to lanceolate or 
narrower: petals small, white or pinkish. In water or mud. 
2. DAMASONIUM, Jussieu. 
1. D. Californicum, Torr. Scapes 6-18 in. high: leaves ovate to narrowly lanceolate, 
long-petioled: flowers in 3 or 4 whorls; pedicels 1-2 in. long: petals 3-4 lines long, 
incised above, white. In water or mud. S. N. Mts. 
3. BSAGITTARIA, Linnzxus. 
1. 8. variabilis, Engelm. Leaves ovate-sagittate or some linear: flowers mostly in 
3's: petals white, rounded 4-2 in. long: tubers edible. In water or mud. 
ORCHIDACER. 
Herbs with a more or less irregular perianth of 3 sepals and 3 petals; the lower peta} 
(made so by a twist in the inferior ovary), called the lip, usually unlike the other two 
which generally resemble the sepals. Stamens and style united to form the column which 
is capped by a single perfect 2-celled anther, or (in Cypripedium) with a perfect anther 
on each side of the stigma over which curves a triangular sterile stamen. Our genera are 
usually grouped in four tribes here briefly defined. 
I, Anther resting lid-like upon the column, deciduous: pollen-masses 4........ 1, 2,3 
If. Anther united with column, persistent on its face above stigma: pollen-masses 2.. 4 
IIL Anther erect on top of column, persistent: pollen-masses 2-4.............. 5 tod 
IV. Anthers 2, lateral; the sterile stamen petaloid, incurved............ 0-05-2000 10 
* Herbs with one to many green leaves: not parasitic. 
Leaf solitary from a globose corm. Scape l-flowered...............ecescececrsccers 1 
Scape 6-20-flowered.........000: ici wae eeeurewe 3 
Leaves several to many from a creeping rootstock...............- aside dawinetieewenaies 6 
Leaves a pair below the raceme of small flowers, ovate or cordate....... tewnseenene FT 
Leaves 2 or 3 to many clasping slender or stoutish stems, at least at base. 
Flowers not leafy-bracted, white or greenish, in spikes or racemes, 
Lip of perianth spurred at base.........+..000. otcsernsrcsccecccocescss & 
Lip not spurred: spike twisted: flowers 3-ranked........sccccsesceseccees & 
Flowers leafy-bracted, pedicellate, 1-20. 
Lip concave at base, constricted in middle.........cceccscccsccecccceces & 
Lip an inflated sac, the mouth with incurved margin............ seceeeee LO 
* * Planta with no green leaves: stems simple, scape-like. 
