TAXACEAE. 



imcular ridges; microsporea papillose to spinulose. Submersed in 1-3 feet 



tcr, Lake Coeur d Alene, I<laho, and doubtless most of the lakes ot the 



n. 



Isoetes minima A. A. Eaton. Leaves 6-12, 2-4 cm. long, terete, slender; 



rangia tted; velum broad, covering most of the sporangium; 



with a circle of long spines on the equator; microspores papillose 



■nd with few Bpinules. Wet places near Waverly, Suksdorf. 



Isoetes howellii Engelm. Leaves 18-50, rather slender, 10-35 cm. long, 

 • marly so, semi-lunate or helmet-shaped in cross section, striate, with 

 abundant stomata above; megasporangia dark-brown, the megaspores bright 

 white, rough, with low, more or less confluent tubercles; microsporangia 

 olh , lliptir or oblong, much pitted, 6-8 mm. long, partly covered by 



the narrow winga of the velum, the microspores unsymmetrical, spinulose on 

 the ridgi 



Borders of ponds mar Moscow, Idaho. The species has been redescribed 

 Isoetes wnderwoodii Henderson. 



Isoetes melanopoda J. Gay. Leaves 15-60, dark-colored at base, 10-45 

 cm. long, with f"iir principal and numerous peripheral bast-bundles; velum 

 very narrow; sporangia spotted; microspores spinulose. Shallow ponds in 

 g Mountains, Idaho, Heller. 



PHYLUM II. SPERMATOPHYTA. Seed Plants. 



Highly organized plants, mostly producing flowers and 

 always producing seeds, each of which contains a young 

 plant (the embryo) usually composed of a stem-like struc- 

 ture (the caulicle or hypocotyl), one or more rudimentary 

 leaves the cotyledons) and a terminal bud (the plumule or 

 cpicotyl); megasporangia (ovules) usually borne on the side 

 or face of an open or closed modified leaf (the carpel) ; micro- 

 Bporangia [anther-sacs) on the end or side of a modified leaf 

 (the filament) and bearing numerous microspores (pollen 

 grains). 



Class IV. GYMNOSPERMAE. 



< )\ ules mega sporangia) naked, not enclosed in an ovary, 



usually on the lace of an open scale but sometimes on the 



axis, in which case the scale is rudimentary or wanting; 



none; cotyledons mostly several in a whorl, 



occasionally only two; perianth none. 



Family 7. TAXACEAE. Yew Family. 

 I- hrube with evergreen linear leaves; flowers dioecious, 



.miin.it. of .i few scaly bracts and a few naked stamens, the 

 of an erect ovule which in fruit becomes a bony 

 I surrounded by a fleshy disk. 



