LOBELIA FAMILY 825 



Aquatic plants with two kinds of flowers, the submerged ones cleistogamous; pod 



splitting on one side. _. ^ ,.^^. , ^' ^^^^'^^P^^^; o 



Land plants of wet situations: flowers all alike; pod sphtting lengthwLsc by 1-3 

 slits, but the valves remaining united at the apex. 3. Bolelia. 



Hypantliium turbinate or oblong; pod 2-celled, 2-valved. 



Corolla with a closed tube. 4. Porterella. 



Corolla split to near the base on the upper side. n. Lobelia. 



1. NEMACLADUS Nutt. 



Small annuals. Leaves alternate, small, the basal ones obovate, the cauline 

 ones reduced, subulate, bract-like. Flowers perfect, irregular. Sepals 5, nearly 

 distinct. Corolla bilabiate; lower lip 3-lobed; upper lip 2-parted. Stamens 5; 

 filaments monadelphous above the middle; anthers oval, free, merely surround- 

 ing the stigma; stigma 2-lobed, Capsule 2-celled, 2-valved from the top, 20-30- 



seeded. 



1. N. ramosissimus Nutt, Stem much branched, about 1 dm. high, gla- 

 brous or puberulent; basal leaves 1 cm. long or less; stem-leaves 1-2 mm. long; 

 hypanthium turbinate, or hemispheric in fruit; sepals lanceolate, 1 mm. long; 

 corolla 2 mm. long. Arid places: s Calif.— s Utah— Ariz. — L. CaUf . Son. Ap-Jl. 



2. HOWELLIA A. Gray. 



Aquatic annual herbs. Leaves alternate, the submerged ones setaceous, 

 the emersed ones narrow, entire. Flowers of two kind, the submerged ones 

 cleistogamous. Hypanthium linear or Unear-clavate. Sepals 5, nearly distmct, 

 narrow and subequal. Corolla of the emersed flowers with its short tube split 

 ahnost to the base on the upper side; lobes nearly equal. Stamens monadel- 

 phous; tube nearly free from the corolla; anthers oval, the two smaller with 6 

 bristles, the three larger naked. Ovary 1-celled, with 2 filiform parietal placentae. 

 Capstde membranous, bursting irregularly on one side. Seeds few, smooth. 



1. H. aquatilis A. Gray. Submerged aquatic, with only the end of the 

 stem emersed; submerged leaves alternate or verticiUate, flaccid, filiform, 1-5 

 cm long less than 1 mm. wide; emersed leaves lance-linear, often toothed; sepals 

 linear-subulate, 2 mm. long; corolla of the submersed flowers rudimentary, that 

 of the emersed flowers 1.5-2 mm. long; fruit 12-15 mm. long. Lakes and ponds : 

 Ore. — Ida. SuhmonL My-Jl. 



3. BOLELIA Raf. 



Glabrous annuals. Leaves alternate, sessile, narrow, entire. ^ Flowers per- 

 fect, axillary, sessile. H^T^Tithium linear-cylindric, usually twisted. Sepals 

 foliaceous, 5, nearly distinct. Corolla with a short, entire tube, p-hpped; upper 

 lip with 2 narrow, spreading or reflexed lobes; lower lip very broad, 3-lobed, 

 spreading. Filaments and anthers wholly united; two of the anthers bristle- 

 tipped. Capsule long and slender, early becoming 1-celled, with 2 parietal 

 placentae, opening by 1-3 long sUts, but valves remaimng united at the apex. 

 Seeds numerous. [Downingia Torr.] 



CoroUa scarcely exceeding the obtuse sepals; stamens shorter than t^^/%^^|Vaf/^?/rtn^/ia. 



idin: 



2. B. elegans. 



1 B. brachyantha Rydb. Stem 1-3 dm. high, branched from the base; 

 leaves oblong-lanceolate, 5-10 mm. long, thick and somewhat fleshy; sepals 

 linear or oblong-Unear, about 5 mm. long; corolla scarcely exceeding the calyx, 

 stamens shorter than the sepals; fruit about 3 cm. long. Dowmngta brachyantha 

 Nels. & Macbr. In water: Mont.— Ida.— Nev.— Ore. SubmonL Je-Au. 



2' B. elegans (Dougl.) Greene. Stem simple or branched below, 5-30 cm, 

 hi<-h* glabrous; leaves lanceolate, 1-3 cm. long, fleshy; sepals linear, 6-7 mm. 

 long; foroUa 8-10 mm. long; fruit 3-4 cm. long. Z). elegans Torr, In water: 

 B.C.— Ida.— Nev. — Calif. SuhmonL Je-Au. 



4. PORTERELLA Torr. 



Small diffuse or creeping annuals or perennials (?). Leaves alternate, narrow, 

 entire Flowers perfect, axillary. Hypanthium oblong-clayate Sepals 5, 

 narrow, ^^^^^t distinct. CoroUa with a long closed tube, not spLt; upper lip 



30* 



