SPIDERWORT FAMILY 145 



Bracts not broader than the leaves, not strongly gibbous at the base; stem usually 



over 3 dm. high, branched. 

 Pod densely glandular-pubescent; sepals broadly lanceolate, densely glandular; 

 plant bright green; branches shorter than the stem proper. 2. T. occidentalis. 

 Pod glabrate» pubescent only in lines or at the apex. 



Pedicels strongly glandular; pods pubescent in lines; branches almost equalling 



the stem. 3. T. larimiensis. 



Pedicels glabrous or slightly glandular above; pods pubescent only at the aper. 



4. T. tiniversitatis. 



Sepals glabrous or nearly so; petals about 10 mm. long; capsule subglobose. 



5. r. scopulorum, 



1. T. bracteata Small. Stem erect, 1-3 dm. high, simple, or sparingly 

 branched, glabrous; leaves linear, 1-2 dm. long, long-acuminate; sepals ovate- 

 lanceolate; corolla about 2.5 cm. broad. Wet meadows: Minn. — Mo. — Kans. — 

 S.D. Plain — Submont. 



2. _T. occidentalis (Britton) Smyth, Stem stout, branched, erect, 2.5-4 

 dm. high; leaves narrowly linear, 2-3 dm. long, attenuate, with rather loose 

 sheaths, glabrous; bracts 5-15 cm. long; sepals ovate-lanceolate, acute, about 1 

 cm. long; petals blue or rose-colored, 12-15 mm. long. Wet meadows: la. — Mo. 

 — Colo.— S.D. Plain — Submont. 



3. T. larimiensis Goodding. Stem 3-4 dm. high, branched, erect, glabrous; 

 leaves narrowly linear, 2-3 dm. long, spreading; bracts narrow, 2-3 mm. broad; 

 sepals lanceolate, acute, 10-12 mm. long; petals dark blue, 15-20 mm. long; fila- 

 ments strongly woolly below. Wet places; Mont. — Colo.— Utah. Plain^Sub- 

 niont. 



4. T. universitatis Cockerell. Stem 3^ dm. high, branched; leaves 

 ascending, linear, attenuate, 2-3 dm. long; bracts narrower, 1-2 dm. long; sepals 

 narrowly lanceolate, about 1 cm. long, acuminate; petals blue, broadly ovate, 

 acute, 15 mm. long. Scarcely distinct from the preceding. Wet places: Mont. 



— S.D. — -Colo. Plain — -Subjnont, 



5. T. scopulorum Rose. Stem more or less branched, 3-4 dm. high; leaves 

 erect, 1-2 dm. long, linear, attenuate; bract narrow, unequal, glabrous; sepals 

 broadly lanceolate, 8 mm. long; petals 1 cm. long or less, blue. Wet places: 

 Ariz. — ^Utah— Colo. — -N.M. So?i. — -SubmonL 



2. COMMELINA (Plum.) L. Day-flower, Dew-flow^er. 



Mostly perennials, with alternate leaves. Bracts usually spathe-like, folded. 

 Flowers irregular, in small cjTiies. Sepals 3, unequal, the larger two more or 

 less united. Petals 3, usually blue, two larger than the third. Fertile stamens 

 3, rarely 2; filaments slender, glabrous; sterile stamens 2 or 3, smaller than the 

 fertile ones. Seeds 2, one above the other, or solitary. 



1. C. crispa Wooton. Perennial, with tuberous roots; stem 3-8 dm. high, 

 branched, finely villous-pubescent above; leaves linear-lanceolate, 3-7 cm. long, 

 4-6 mm. wide; spathe 1.5-2 cm. long, strongly curved, pubescent and bearded 

 at the base; sepals broadly' elliptic-rotund, the upper one slightly narrower and 

 half as long; upper two petals broadly reniform, 1-1.5 mm. long, bright blue, 

 the third white, lanceolate, 2-3 mm. long; fertile stamens 3; staminodia 3. 

 Sandy places : Ind. — Xeb. — Colo. — Ariz. — Tex. Plain, 



Family 17. PONTEDERIACEAE. Pickerel-weed Family. 



Perennial bog or water plants, with rootstocks and alternate or basal 

 leaves. Flowers perfect, more or less irregular. Sepals and petals each 3, 

 both colored and partly united. Stamens 3-6; filaments partly adnate to 

 the perianth. Pistil of 3 united carpels; ovary 3-celIed, or by abortion 1- 

 celled. Fruit a many-seeded capsule or a 1-seeded utricle. 



stamens unequal, the 2 posterior ones with ovate anthers, the third with a sagittate 

 anther; capsule incompleteiy 3-celled: ieaf-blades broad, long-petioled. 



1. Heteranthera. 



stamens all alike; anthers all sagittate; capsule 1-celled, with 3 parietal placentae; leaf- 

 blades linear, translucent, sessile. - 2. Zostkrell-\. 



9 



