Part 1, 1918] RUBIACEAE 
Flowers all or mostly on long filiform pedicels; capsule 
turbinate. 
Calyx-lobes obtuse, equaling or shorter than the hypan- 
thium at anthesis; capsule about as broad as long; corolla 
4-6 mm. long. 
Calyx-lobes very acute, longer than the hypanthium at an- 
thesis; capsule longer than broad; corolla 7-8 mm. long. 
Capsule much broader than long; leaf-blades elliptic or broader. 
Corolla-tube not exceeding the calyx-lobes. 
Corolla-tube twice as long as the calyx-lobes or longer. 
Plants perennial. 
Plants with slender creeping rootstocks or with long creeping stems. 
Pedicels several times as long as the capsules; stems herbaceous. 
Stems erect. 
Stems creeping. 
Corolla 10-12 mm. long; leaves rounded or obtuse at the 
apex. 
Corolla about 7 mm. long; leaves mostly acute. 
Pedicels about as long as the capsules; stems suffruticose. 
Plants erect or ascending, never with creeping rootstocks. 
Capsule more than half inferior. 
Stems glabrous. 
Corolla 4-7 mm. long; stems herbaceous. 
Capsule longer than broad; leaf-blades mostly linear. 
Capsule broader than long; leaf-blades mostly ovate. 
Corolla 10-15 mm. long. 
Branches terete, herbaceous; leaves not fascicu- 
late. 
Branches angulate, fruticose; leaves more or less fasci- 
culate. 
Stems hirtellous or scabrous. 
Flowers in cymes; leaves not acerose; corolla-tube minutely 
hirtellous outside. 
Flowers mostly solitary; leaves acerose; corolla-tube glab- 
rous. 
Leaves mostly verticillate; flowers sessile or nearly so; 
stems fruticose almost throughout. 
Leaves opposite; flowers mostly pedicellate; stems 
fruticose only below. 
Capsule half or less than half inferior. 
Plants fruticose throughout; leaves fasciculate. 
Plants herbaceous; leaves not fasciculate. 
Capsule broader than long. 
Free portion of the capsule scabro-hirtellous; leaves 
filiform. 
Free portion of the capsule glabrous; leaves linear to 
ovate. 
Cauline leaves linear. 
Cauline leaves broadly lanceolate to broadly ovate. 
Corolla 6-8 mm. long; calyx-lobes at anthesis 
lance-linear, about 3 times as long as the 
hypanthium. 
Corolla 9-11 mm. long; calyx-lobes at anthesis 
ovate-oblong or lance-oblong, less than twice 
as long as the hypanthium. 
Capsule as long as broad or longer. 
Plants with basal rosettes of leaves at time of flowering, 
the leaves copiously ciliate. 
Plants without basal rosettes of leaves at time of 
flowering, the leaves not ciliate but sometimes 
scabrous on the margins. 
Free portion of the capsule glabrous. 
Leaves filiform or narrowly linear; capsule 
1.5 mm. long. 
Leaves all or most of them oblong-linear or 
broader; capsule 2-4 mm. long. 
Calyx-lobes in fruit much exceeding the 
capsule, about twice as long as the 
hypanthium. 
Calyx-lobes in fruit little if at all exceeding 
the capsule, about as long as the hypan- 
thium. 
Free portion of the capsule very scabrous. 
Capsule about 1.5 mm. long; leaves lance- 
linear, pungent; flowers in small dense cymes, 
mostly on very short pedicels. 
Capsule about 2.5 mm. long; leaves narrowly 
linear, not pungent; flowers mostly solitary, 
on long pedicels. 
10. 
11. 
Ue 
US: 
14. 
15. 
16. 
17. 
Ds 
18. 
19. 
20. 
21. 
De 
23: 
24. 
33. 
26. 
Pile 
28. 
29: 
30. 
ol. 
32: 
34. 
30. 
my ey y 
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may 
25 
. Brandegeana. 
. asperuloides. 
. minima. 
. pusilla. 
. caerulea. 
. Serpyllifolia. 
. umbratilis. 
. serpyllacea. 
. angustifolia. 
. gracilis. 
. brevipes. 
- mucronata. 
. peninsularis. 
- acerosd. 
. polypremoides. 
. fasciculata. 
. longipes. 
. tenutfolia. 
. purpurea. 
. montana. 
. Canadensis. 
. floridana. 
. lanceolata. 
. longifolia. 
. rupicola. 
. Palmeri. 
