172 American Midland Naturalist Monograph No. 2 



1. Petals yellow, 4-8 mm. long; capsules 3-6 mm. in diameter. 



3. Styles distinct; leaves without dark stipular glands; false septa of the cap- 

 sule nearly complete, not ciliate; plants perennial. 

 4. Inner sepals minutely glandular-ciliolate; sandy soil, local. July-Aug. 



[L. medium var. texanum (Planch.) Fern.] 



L. medium (Planch.) Britt. 



4. Sepals entire. 



5. Outer sepals 3-3.5 mm. long at maturity; dry open woods, local. 



June- Aug L. vhginianum L. 



5. Outer sepals 2-2.5 mm. long at maturity; damp ground, s. III., rare. 



July-Aug L. striatum Walt. 



3. Styles united below; outer sepals 4-6 mm. long, lanceolate, acuminate, 

 strongly glandular-ciliolate; leaves with dark stipular glands; false septa 

 of the capsule incomplete, conspicuously ciliate; plants annual; dry soil, 

 local. July-Sept L. sidcatum Riddell 



88. Balsaminaceae Lindl. — Jewel-weed Family 



1. Impatiens L. — Jewel-weed 



1. Flowers orange, thickly red-dotted; spur strongly incurved; moist woods, 



common. June-Sept. Spotted Touch-me-not /. biflora Walt. 



1. Flowers pale yellow, sparingly red-dotted; spur bent at a right angle to the 



sac; moist woods, common. July-Sept. Pale Touch-me-not 



/. pallida Nutt. 



89. Limnanthaceae Lindl. 



1. Floerkea Willd. — False Mermaid 

 F. proserpinacoides Willd. Wet ground, local. Apr.-June. 



90. Zygophyllaceae Lindl. — Caltrop Family 



1. Flowers (in our species) 1-1.5 cm. in diameter; carpels five, several-ovuled, at 

 maturity bearing 2-4 prickles 1. Trlhiihis 



1. Flowers (in our species) 2-2.5 cm. in diameter; carpels ten, 1-ovuled. tuberculate. 

 not spiny 2. Kalhtroemia 



I. Tribulus L. — Caltrop 



T. terrestris L. Puncture-weed. Waste places and sandy soil, occasional; 

 nat. from s. Eur. June-Sept. 



2. Kallstroemia Scop. 



K. intermedia Rydb. Railroad yards, occasional; adv. from s. U.S. or trop. 



Am. Blue Island, near Chicago. Babcock- [K- maxima sensu auth., non T. &C 



G.] 



9L Rutaceae Juss. — Rue Family 



1. Leaves pinnate; branches often prickly; fruit of 1-5 two-valved follicles 



1 . ZanihoxXilum 



1 . Leaves trifoliolale; branches not prickly; fruit a 2-seeded. suborbicular s;"^-'-- 



2. Pielea 



