ONAGRACE^.. (eVENING-PRIMROSK FAMILY.) 187 



••- t- Fruit dry and indehiscent, 1-4-sceilcd. Leaves alteiiiate. 

 5. Gaura. Calyx-tube obconical. Filaments apj)endaged at bas»-. 

 G. Stcnosiplion. Calyx-tube lilifonn. Filaments not appcndaged. 



♦ • Parts of the flower in twos. Leaves opposite. 



7. Circaea. Petals 2, obcordatc or 2-lobed. Stjuncns 2. Fruit I -S-see<leil, bristly. 



1. JUSSI^A, L. 



Calyx-tul)e elongated, not at all j)r()l()nge(l beyond the ovary ; the lohes 4-6, 

 herl)ac'eous and persistent. Petals 4-9. Stamens twice jus many as the petals. 

 Capsule 4-6-cellcd, usually long, opening between the ribs. Seeds very nu- 

 merous. — Herbs (ours glabrous perennials), with mostly entire and alternate 

 leaves, and axillary yellow flowers, in summer. (Dedicated to Bernard de 

 Jussien, the founder of the Natural System of Botany.) 



1. J. deClirrens, DC. Stem erect (1-2° high), branching, winged by the 

 decurreut lanceolate leaves ; cali/x-luhes 4, as long us the petals ; cdpsiile oUonr/- 

 club-shaped, iving-an'jJed ; seeds in several rows in each cell. — Wet places, V:i, 

 to Fla., west to S. 111., Ark., and La. 



2. J. ripens, L. Stem creeping, or floating and rooting ; leaves oblong, 

 tapering into a slender petiole ; flowers large, long-peduucled ; caii/x-iohcs and 

 obocate petals 5 ; pod woody, cylindrical, with a tapering base ; seeds quadrate, 

 in 1 row in eacii cell, adherent to the spongy endoearp. — In water, 111. and 

 Ky. to E. Kan., Ark., and Tex. 



2. LUDWIGIA, L. False LoosESTitiFii. 



Calyx-tul)e not at all prolonged beyond the ovary; the lobes 4, usually per- 

 sistent. Petals 4, often small or wanting. Stamens 4, Capsule short or 

 cylindrical, many-seeded. Seeds minute, naked. — Pereimial herbs, with axil- 

 lary (rarely capitate) flowers, through summer and autumn. (Named for C. G. 

 Ludicig, Pi-ofessor of Botany at Leipsic, contemporary with Linna;us.) 



* Leaves cdl alternate, sessile or nearly so. 



•*- Flowers peduncled in the upper axils, with conspicuous i/elloiu petals (4-8" 

 long), equalling the orate or lanceolate foliaceous lobes of the calgx. 



1. L. alternifolia, L. (Seed-hox.) Smooth or nearly so, branched 

 (3° high); leaves lanceolate to linear-lanceolate, acute or pointed at both ends; 

 capsules cubical, rounded at base, wing-angled. — Swami)s, K. Mjvss. to Fla., 

 west to Mich., E. Kan., and La. 



2. L. hirt^Ua, Kaf. Ifairg all over; stems nearly simjile (I -2° liigh) ; 

 leaves oblong, or the upper lanceolate, blunt at both ends ; capsules nearly as in the 

 last, but scarcely wing-angled. — Moist pine barrens, N. J. to Fla, and Tex. 

 ■*- H- Flowers small, sessile {solitari/ or sometimes clustered) in the axils, with very 



small greenish petals {in n. 5) or niostli/ none ; leaves mostly lanceolate or linear 

 on the erect stems (1-3° high) and numei-ous branches ; but prostrate or creep- 

 ing sterile shoots often produced from the base, thickly beset with shorter ol" 

 ovate or spatulate leaves. (Our species glabrous, except n. 3.) 



3. L. sphserocarpa, Ell. Minutely pubescent, especially the calyx, or 

 Dearly glabrous; leaves lanceolate or linear, acute, tapering at ba.se, those 

 of the runners obovate with a wedge-shaped base and glandular-denticulate; 



