PLATE 
ILLUSTRATIONS. 
PLATES. 
Facing page. 
1. Asplenium andrewsii A, Nelson. ...--------+++++2+eee2er eee Frontispiece 
2. Asplenium andrewsit A, Nelson. .-..------+-+++-++2e-see streets 2 
3. Olneya tesota A. Gray. .--.- 2-22-2222 eee eee eee e cere e sees 11 
4. Abutilon macdougalit Rose & Standley. .....---------+++++++++++: 13 
5. Sphaeralcea macdougalit Rose & Standley. ...-.-------+-++-+++++++ 13 
6. Elaphrium microphyllum (A. Gray) Rose. ....---+++-+++-+2225+00+ 14 
7. Carnegiea gigantea (Engelm.) Britton & Rose. ..-.--------------+-- 15 
8. Echinocereus engelmanni (Parry) Riimpl.......----------++++++-++- 15 
9, Echinocereus engelmanni (Parry) Riimpl.-.......---------++++++++- 15 
10. Opuntia bigelovii Engelm....-.------------ +--+ 22eerce rere 16 
11. Euploca aurea Rose & Standley.....--.-------+-+++++++2+222eereee 16 
12, Dicoria calliptera Rose & Standley. ...-------------+++++++22e500+ 18 
13. Isocoma fruticosa Rose & Standley. ..-.-----------+++++e2re rrr ere 18 
14. Isocoma limitanea Rose & Standley... --.----------------+-+e0+++ 19 
15. Sideranthus viridis Rose & Standley. .....-----------------+-++e-0+ 19 
16. Viguiera sonorae Rose & Standley........---------++2++eee errr eee 20 
17. Tumamoca macdougalit Rose.....---..---+-++----22 22 ere ttt rerecee 21 
18. Hemitelia contigua (Underw.) Maxon........----------++++++++- 32 
19, Hemitelia pittieri Maxon and H, subglabra (Underw.) Maxon.....--- 32 
90. Hemitelia chiricana Maxon.........2+-------2- eee e eee e eerie 33 
21. Hemitelia arachnoidea (Underw.) Maxon and H, mutica Christ--....- 34 
92. Hemitelia apiculata Hook....-.-.-------------+ 22 eer errr e cree 35 
93. Hemitelia grandis Maxon......-------+--------- 222 e crete terres 37 
24. Four species of Hemitelia.....-.-.-------------+-+-+2+-+eerrrrcee 39 
25. Hemitelia grandifolia Willd.......---+--------- +2222 re rere rere 41 
26. Hemitelia kohautiana (Presl) Kunze.....-...-----------+-+--++++++- 45 
27. Polystichum ambiguum Maxon. ...-.---------++-+2+2+22022e0erctee 50 
98. Pteropsis underwoodiana Maxon.....-.--------+-+-++++-+55+0erttte 51 
29, Dicranopteris bifida (Willd.) Maxon. ....----------+-++++2++++777+ 52 
80. Cibotium sehiedei Schlecht. & Cham.........----------++++++++-+-- 55 
31. Cibotium regale Versch. & Lem. ..-.--------------+++2+222+ereree 56 
39. Cibotium wendlandi Mett. and C, guatemalense Reichenb...-..----- 57 
33. Goniophlebium eatoni (Baker) Maxon....----------+------+-++++0+- 60 
34. Goniophlebium rachipterygium (Liebm.) Moore.....-.------ sueueues 61 
35 A. Fruit of Nymphaea microphylla Pers. B. Fruit of Nymphaea 
fraterna Miller & Standley. C. Fruit of Nymphaea advena Ait. -. 72 
36. Seeds of several species of Nymphaea..-...-...----------+2eee-+: 73 
37. Nymphaea americana (Provancher) Miller & Standley, in Flathead 
Lake, Montana. ...----.--2--- cece eee eee eee eee cece tesesessees 78 
38. Fruit of Nymphaea americana (Provancher) Miller & Standley, from 
Springfield, Massachusetts.......---------+--+eeece ere rc eseeeee 79 
39. Nymphaea advena Ait., in Monteers Pond, Knox County, Indiana. . 84 
40. A. Earlier vernal stage of Nymphaea advena Ait., Four Mile Run, Vir- 
ginia. B. Later vernal stage of Nymphaea advena Ait., Four Mile 
Run, Virginia. .....-...-- 2... ee eee eee eee cece een e eee e eee 85 
